Disruption of the body's internal clock. Review possible symptoms, contributing factors, assessment, warning signs and care options.
About Circadian Rhythm Disorders
Disruption of the body's internal clock
Circadian rhythm disorders occur when the body's internal clock is out of sync with the external environment.
This can result from shift work, jet lag, or intrinsic factors affecting the biological clock.
Editorial update (28 September 2026): structured medical content awaits clinical reviewer sign-off.
How assessment may be approached
A clinician may review sleep timing, duration, daytime symptoms, snoring or breathing pauses, medicines, caffeine, mental health, shift work and sleep environment. A sleep diary, tests or specialist referral may be used when indicated.
Care may involve sleep hygiene, treatment of an underlying medical or mental-health problem, behavioral treatment such as CBT-I, breathing treatment when sleep apnea is suspected, or a carefully reviewed medicine plan.
When to seek prompt care
Seek urgent care for severe breathing difficulty, new confusion, chest pain, fainting, dangerous daytime sleepiness causing immediate risk, or symptoms suggesting stroke or another acute condition.
Symptoms
- Difficulty falling asleep
- Excessive daytime sleepiness
- Insomnia
- Fatigue
- Poor concentration
Possible causes
- Shift work
- Jet lag
- Delayed sleep phase
- Advanced sleep phase
- Irregular sleep schedule
Care and treatment options
- Light therapy
- Melatonin
- Sleep schedule adjustment
- Chronotherapy
- Good sleep hygiene
Key points
- Affects shift workers commonly
- Light exposure is key treatment
- Can be temporary or chronic
- Manageable with proper treatment
Preparing for a consultation
- A two-week sleep and wake diary if possible.
- Caffeine, alcohol, tobacco, medicine and supplement use.
- Bedtime routines, shift pattern and daytime impairment.
- Any observed snoring, breathing pauses or unusual sleep behavior.
Questions worth asking
- Is Circadian Rhythm Disorders the most likely explanation for these symptoms, and what alternatives should be checked?
- Which symptoms or findings would require urgent review?
- Are medicines, underlying health problems or lifestyle factors contributing?
- What tests or examinations are needed now, and what can safely wait?
- What treatment or self-care options are reasonable, and when should I be reviewed again?
- What is the expected benefit, limit, cost and follow-up plan for the suggested care?
Related conditions
Related clinicians
Medical information limitations
This page summarizes listed condition information and cannot confirm a diagnosis or choose treatment. Do not start, stop or change prescribed treatment based only on this page.
Common questions
What is Circadian Rhythm Disorders?
Disruption of the body's internal clock This is general information; the name describes a possible diagnosis or clinical problem, not a personal diagnosis.
How might a clinician assess Circadian Rhythm Disorders?
A clinician may review sleep timing, duration, daytime symptoms, snoring or breathing pauses, medicines, caffeine, mental health, shift work and sleep environment. A sleep diary, tests or specialist referral may be used when indicated.
What care may be discussed?
Care options listed include Light therapy, Melatonin, Sleep schedule adjustment, Chronotherapy. Which option is appropriate depends on the confirmed cause, severity, preferences and contraindications.
When should Circadian Rhythm Disorders be checked urgently?
Seek urgent care for severe breathing difficulty, new confusion, chest pain, fainting, dangerous daytime sleepiness causing immediate risk, or symptoms suggesting stroke or another acute condition.
How should I prepare for a consultation?
A two-week sleep and wake diary if possible. Caffeine, alcohol, tobacco, medicine and supplement use. Bedtime routines, shift pattern and daytime impairment. Any observed snoring, breathing pauses or unusual sleep behavior. Bring previous reports and a current medicine list where relevant.
Can this page diagnose or treat the condition?
No. A page about Circadian Rhythm Disorders can help you understand possible features and questions, but it cannot confirm a diagnosis or choose treatment. A qualified clinician should assess your symptoms, history and any test results.
General information only; it is not a diagnosis or a substitute for a qualified clinician’s advice.