For most of us, a nightmare is usually blamed on three suspects: stress, a too-late dinner, or that “just one more episode” decision made at 12:43 a.m. But emerging research suggests that, for some people living with autoimmune diseases, especially systemic lupus erythematosus, a sudden increase in vivid nightmares or hallucination-like experiences may be more than a weird sleep chapter. It could be an early clue that the immune system is shifting into trouble mode.
That does not mean every bad dream is a medical emergency. If that were true, half the country would be in a waiting room after dreaming about missing a final exam in socks. But a 2024 study published in eClinicalMedicine and highlighted by UC Davis Health has drawn attention to a serious and under-discussed possibility: neuropsychiatric symptoms such as disrupted dream sleep, vivid nightmares, confusion, and hallucinations may sometimes appear before an autoimmune disease diagnosis or before a flare.
The finding matters because autoimmune diseases are famous for being sneaky. Symptoms may arrive, leave, change costumes, and come back wearing a fake mustache. Fatigue, joint pain, rashes, fever, mouth sores, headaches, brain fog, and mood changes can overlap with everyday life, infections, stress, medication side effects, and many other conditions. When unusual sleep or perception changes enter the picture, patients may feel embarrassed, frightened, or unsure whether to mention them. The new message from researchers is simple: mention them anyway.
What the New Research Found
The study that sparked recent headlines focused heavily on lupus, a chronic autoimmune disease in which the immune system attacks the body’s own tissues. Lupus can affect the skin, joints, kidneys, blood cells, heart, lungs, and brain. It often moves in cycles, with periods of remission followed by flares, when symptoms return or worsen.
Researchers surveyed 676 people living with lupus and 400 clinicians. They also interviewed 69 people with systemic autoimmune rheumatic diseases and 50 clinicians. Participants were asked about the timing of 29 mental health and neurological symptoms, including depression, hallucinations, loss of balance, and disrupted dream sleep. The goal was not to turn nightmares into a crystal ball, but to understand whether symptom patterns might help patients and doctors recognize disease activity earlier.
One striking result: three in five lupus patients reported disrupted dream sleep. About one-third of those patients said the symptom appeared more than a year before lupus began. Just under one in four reported hallucinations, and for many, these experiences appeared around the time of disease onset or later. Interviews also suggested that increasingly disrupted dream sleep sometimes appeared shortly before hallucination-like experiences.
Researchers used the term “daymares” to help patients describe hallucination-like experiences in less stigmatizing language. That wording may sound like something invented by a sleep-deprived poet, but it helped some people explain the feeling: dreamlike experiences while awake, often strange enough to be unsettling, but not always easy to label.
Why Autoimmune Diseases Can Affect the Brain
Autoimmune diseases are not limited to one neat little corner of the body. The immune system is more like a national weather system than a desk fan. When inflammation rises, effects may be felt in many places, including the nervous system.
In lupus, the brain and central nervous system can be affected directly or indirectly. Some people experience cognitive dysfunction, often called “lupus brain fog,” which may include memory trouble, confusion, difficulty finding words, or problems concentrating. Rarely, lupus can be linked with more serious neuropsychiatric symptoms, including seizures, psychosis, or hallucinations. Certain medications, infections, sleep deprivation, metabolic problems, and other medical conditions can also cause similar symptoms, which is why a careful medical evaluation is essential.
This is the key point: hallucinations or vivid nightmares do not automatically mean lupus, and they do not automatically mean a psychiatric disorder either. They are symptoms. Symptoms are clues. Clues need context. A detective who solves the whole case after finding one sock under the couch is not a genius; he is probably wrong.
Nightmares, Hallucinations, and “Daymares”: What Do These Words Mean?
Nightmares
Nightmares are vivid, disturbing dreams that wake a person from sleep. They often happen during REM sleep, the stage associated with intense dreaming. Occasional nightmares are common, especially during stress, illness, poor sleep, or major life changes. Frequent nightmares that disrupt daily life may need medical attention, whether or not autoimmune disease is involved.
Hallucinations
Hallucinations involve sensing something that is not actually present, such as seeing, hearing, feeling, or smelling something others do not. Hallucinations can have many possible causes: sleep disorders, fever, medications, neurological conditions, mental health conditions, substance exposure, severe stress, or autoimmune inflammation affecting the nervous system.
“Daymares”
“Daymares” is not a standard diagnosis. It is a patient-friendly term used in the study interviews to make difficult experiences easier to discuss. For some people, it described a dreamlike, unreal, or strange experience while awake. The word matters because shame keeps symptoms hidden. A softer phrase can open the door to a more honest conversation with a doctor.
Why These Symptoms Are Easy to Miss
There are several reasons nightmares and hallucinations may not be connected with autoimmune disease right away. First, people do not always think of sleep and perception as immune-system topics. A rash? Sure. Swollen joints? Definitely. Dreaming that your hallway turned into a foggy train station? That sounds like something to discuss with your pillow, not your rheumatologist.
Second, many patients worry they will not be believed. Mental and neurological symptoms still carry stigma, even though the brain is an organ like the heart, lungs, or kidneys. If inflammation can affect blood vessels, joints, and skin, it should not be shocking that it can affect cognition, mood, and sensory experiences too.
Third, doctors are busy, appointments are short, and autoimmune diseases are complicated. A patient may come in focused on joint pain, fatigue, hair loss, fever, or kidney labs. Unless the clinician asks directly about sleep, nightmares, confusion, mood, and perception changes, those symptoms may stay off the table.
What This Means for Lupus Patients
For people already diagnosed with lupus, the research supports something many patients have said for years: flares often have personal warning signs. One person may notice fatigue and joint stiffness. Another may get mouth sores and headaches. Someone else may feel unusually foggy, emotionally off-balance, or sleep in a way that feels different from their normal stress dreams.
The practical takeaway is not to panic over every nightmare. Instead, pay attention to patterns. A single strange dream after eating spicy nachos at 11 p.m. is probably just your digestive system filing a complaint. But a new cluster of vivid nightmares, disrupted sleep, confusion, or hallucination-like experiencesespecially when combined with classic lupus flare symptomsdeserves a call to a healthcare professional.
Common lupus flare symptoms can include fatigue, fever, joint pain or swelling, skin rashes, mouth sores, hair loss, headaches, chest discomfort with deep breathing, swollen glands, and mood or cognitive changes. Because lupus can affect major organs, flares can range from mild to serious. Early communication with a care team can help reduce risk and guide treatment.
What This Means for People Without a Diagnosis
Autoimmune diseases can take years to diagnose because early symptoms are often vague. A person may bounce between explanations: stress, poor sleep, anxiety, allergies, hormones, a viral infection, overwork, or “maybe I just need more water,” the internet’s favorite medical prescription for everything.
If vivid nightmares or hallucination-like experiences appear along with other unexplained symptoms, it may be worth asking whether an autoimmune evaluation is appropriate. Red flags that deserve medical attention include persistent fatigue, unexplained fevers, joint swelling, recurring rashes, sun sensitivity, mouth sores, hair loss, chest pain with deep breathing, unusual numbness or tingling, memory problems, seizures, or kidney-related signs such as swelling around the eyes or legs.
Family history also matters. If close relatives have lupus, rheumatoid arthritis, thyroid disease, multiple sclerosis, inflammatory bowel disease, psoriasis, or other autoimmune conditions, tell your clinician. Family history does not guarantee a diagnosis, but it gives the doctor a better map.
Why Doctors Should Ask About Sleep and Neuropsychiatric Symptoms
The research also sends a message to clinicians: ask better questions. “How are you sleeping?” is useful, but it may not be enough. More specific questions can uncover patterns patients would never volunteer on their own.
Examples include: Have your dreams become unusually vivid or disturbing? Are you waking more often? Do you feel confused during the day? Have you noticed changes in memory, speech, balance, mood, or perception? Do these symptoms happen before your joint pain, rash, or fatigue worsens?
These questions can help create a patient’s personal symptom timeline. That timeline may be valuable because autoimmune diseases often behave differently from person to person. There is no universal flare alarm that flashes red and plays dramatic movie music. Each patient may have their own version of the warning system.
Do Nightmares Cause Autoimmune Flares?
No evidence shows that nightmares themselves cause autoimmune disease or directly trigger flares. The relationship appears more like a smoke alarm than a match. Nightmares and disrupted dream sleep may be signs that something is happening in the body or brain, not necessarily the reason it is happening.
However, sleep and inflammation do influence each other. Poor sleep can worsen pain sensitivity, mood, fatigue, and immune regulation. Autoimmune inflammation can also disturb sleep. In other words, the relationship can become a messy loop: inflammation disrupts sleep, poor sleep makes the body feel worse, and the patient is left wondering why their bed has become a nightly mystery theater.
That is why sleep changes are worth tracking. They may help patients notice a flare earlier, and they may also identify treatable problems such as insomnia, sleep apnea, medication side effects, anxiety, depression, or pain that is not well controlled.
How to Track Symptoms Without Turning Into a Full-Time Spreadsheet Goblin
Symptom tracking does not need to become a second career. The best system is the one a person will actually use. A simple note on a phone, a paper calendar, or a health app can work.
Track these details
- Date and time of sleep changes, nightmares, or unusual dream intensity
- Whether the dream woke you up or affected your mood the next day
- Any hallucination-like or “daymare” experience while awake
- Other symptoms, such as fatigue, fever, rash, joint pain, headache, mouth sores, or brain fog
- Medication changes, missed doses, infections, stress, sun exposure, menstrual cycle changes, or major schedule disruptions
- How long the symptoms lasted and whether they improved
After a few weeks or months, patterns may become clearer. Maybe nightmares appear before fatigue spikes. Maybe poor sleep follows steroid dose changes. Maybe hallucination-like symptoms happen only during fever or extreme sleep deprivation. This information can help clinicians separate autoimmune activity from other possible causes.
When to Seek Medical Help
People should contact a healthcare professional if they experience new or worsening hallucinations, confusion, severe mood changes, seizures, intense headaches, sudden weakness, vision changes, chest pain, shortness of breath, swelling, fever, or symptoms that feel dramatically different from their usual pattern. Anyone already diagnosed with lupus or another autoimmune disease should ask their care team what symptoms require urgent attention.
It is especially important not to stop prescribed autoimmune medications without medical guidance. Some medications can affect mood or sleep, but suddenly stopping treatment may worsen disease activity. The safer move is to report symptoms and ask the clinician to review possible causes, including disease activity, medication effects, infection, sleep disorders, and mental health factors.
Reducing Stigma: The Brain Is Not a Side Quest
One of the most important lessons from the research is that patients need permission to talk about strange symptoms without feeling judged. The brain is not a bonus organ. It is central command. If autoimmune inflammation can affect the brain, then cognitive, emotional, and sensory symptoms belong in the medical conversation.
Using terms like “daymares” may help, but the larger goal is cultural: patients should not have to prove they are “normal enough” before their physical symptoms are taken seriously. A person can have anxiety and lupus. A person can have medication side effects and a flare. A person can have nightmares from stress and still need evaluation for autoimmune disease. Medicine works best when it can hold more than one possibility at a time.
Practical Ways to Support Sleep During Autoimmune Disease
Good sleep will not cure lupus or other autoimmune diseases, but it can support overall health and make symptoms easier to manage. The basics still matter, even if they sound annoyingly simple.
Try to keep a consistent sleep schedule, limit late caffeine, reduce bright screens before bed, create a cool and comfortable sleep environment, and build a wind-down routine that does not involve scrolling through alarming health forums at midnight. Gentle stretching, calming music, breathing exercises, or reading can help cue the brain that the day is closing.
People with pain may need a more personalized plan. Joint discomfort, headaches, steroid timing, itching, temperature sensitivity, or anxiety about symptoms can all interrupt sleep. A healthcare team may suggest medication adjustments, pain-management strategies, sleep evaluation, therapy for recurring nightmares, or screening for sleep apnea or restless legs syndrome.
The Bigger Picture: Earlier Recognition Could Improve Care
Autoimmune diseases are often treated more successfully when changes are caught early. If nightmares, disrupted dream sleep, hallucinations, or other neuropsychiatric symptoms help identify flares sooner, they could become part of a more personalized warning system.
This does not mean doctors should diagnose lupus based on dreams. It means they should listen when patients say, “This happens before I get sick.” In chronic illness care, patient pattern recognition is valuable. Patients live with their bodies full-time. Doctors bring training and testing. The best outcomes often come when both forms of knowledge sit at the same table and share the snacks.
Experiences Related to Nightmares, Hallucinations, and Autoimmune Flares
People living with autoimmune disease often describe the period before a flare as a collection of small changes that only make sense later. At the time, each clue can seem too ordinary to report. A person may sleep badly for three nights, feel unusually tired, forget a familiar word, and wake from dreams that feel more intense than usual. Alone, each symptom might look like stress. Together, they may be the body tapping the microphone before the main announcement.
One common experience is the “my sleep got weird first” pattern. A patient may notice dreams becoming brighter, louder, or more emotionally charged. They may wake up feeling as if they have already lived an entire chaotic day before breakfast. Then, within days or weeks, more familiar flare symptoms may appear: joint stiffness, a low-grade fever, a rash after sun exposure, mouth sores, or fatigue that feels nothing like normal tiredness. This does not prove the dream changes caused the flare. It suggests that sleep changes may belong on the same symptom timeline.
Another experience is hesitation. Many people are comfortable telling a doctor, “My knees hurt,” but less comfortable saying, “My dreams have changed,” or “I had a dreamlike moment while awake.” That hesitation is understandable. Nobody wants to be dismissed, mislabeled, or handed a look that says, “Please exit through the awkward door.” But the research highlights why these details matter. When patients describe symptoms clearly and calmly, doctors get a better chance to investigate the full picture.
Families may notice changes too. A partner might say, “You’ve been waking up upset more often,” or a parent might notice a teen with lupus becoming more forgetful, withdrawn, or exhausted before physical symptoms intensify. These observations should be handled gently. The goal is not to police someone’s mood or dreams. The goal is to help document patterns that may support better care.
Some patients find it useful to create a “flare forecast” note. It might include early signs such as poor sleep, vivid nightmares, brain fog, light sensitivity, joint pain, mouth sores, feverish feelings, or mood changes. The note can also list what helps: calling the rheumatology office, reducing sun exposure, prioritizing rest, checking medications, arranging lab work if recommended, and avoiding the heroic but unhelpful plan of pretending everything is fine while running on two hours of sleep and iced coffee.
For people who have hallucination-like experiences, the most helpful step is prompt, nonjudgmental medical evaluation. These symptoms can have many causes, and some are treatable. A clinician may need to review autoimmune activity, medication effects, infections, sleep deprivation, neurological issues, and mental health factors. The point is not to be scared of the symptom. The point is to take it seriously enough to get help.
The human side of this research is simple: people want language for what is happening to them. When a patient hears that vivid nightmares or “daymares” can sometimes occur in systemic autoimmune disease, it may replace shame with relief. Not because the symptom is pleasant, but because it becomes speakable. And once a symptom is speakable, it can be tracked, investigated, and treated with the seriousness it deserves.
Conclusion
Nightmares and hallucinations are not everyday diagnostic tools, and they should never be used to self-diagnose lupus or any autoimmune disease. But they may be important warning signs for some people, especially when they appear alongside fatigue, joint pain, rashes, fever, brain fog, mouth sores, or other autoimmune symptoms.
The new research encourages a smarter, less stigmatized conversation about the brain’s role in autoimmune disease. Patients should feel safe reporting unusual sleep, dream, mood, cognitive, or perception changes. Clinicians should ask about them directly. Together, those conversations may help detect autoimmune disease activity earlier, reduce misdiagnosis, and give patients a better chance to manage flares before they fully crash the party.
Medical note: This article is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment. New hallucinations, confusion, seizures, severe headaches, chest pain, breathing problems, sudden weakness, or major changes in mental status should be discussed with a qualified healthcare professional promptly.
