Circadian rhythm disorders involve mismatch between internal sleep-wake timing and desired/required schedule. Circadian rhythm disorders include several types with specific treatments.
Major types
Delayed Sleep Phase Syndrome (DSPS): “Night owls” who can’t fall asleep until 2-6 AM and want to sleep until late morning. Common in adolescents, young adults.
Advanced Sleep Phase Syndrome: “Early birds” falling asleep early evening (7-9 PM) and waking very early (3-5 AM). More common in older adults.
Non-24-hour Sleep-Wake Disorder: Sleep-wake cycle longer than 24 hours, common in blind individuals.
Shift Work Sleep Disorder: Insomnia and excessive sleepiness from working non-traditional hours.
Jet Lag: Temporary disruption from rapid timezone changes.
Irregular Sleep-Wake Rhythm: Fragmented sleep across 24 hours, common in dementia.
Diagnosis
- Sleep diary 2+ weeks
- Actigraphy (wrist activity monitor)
- Salivary melatonin testing in some cases
- Distinguishing from primary insomnia
Treatment approaches
Light therapy:
- Bright light (10,000 lux) for 30-60 minutes
- Morning light for delayed sleep phase
- Evening light for advanced sleep phase
- Light box or natural sunlight
Melatonin:
- Low doses (0.3-1 mg) often more effective than high
- Timing matters more than dose
- Evening dose for delayed sleep phase
- Effective for circadian disorders, less for primary insomnia
Schedule manipulation:
- Gradual shift toward desired schedule
- Strict adherence to wake times
- Limit sleeping in
Specific conditions
For specifics see our delayed sleep phase syndrome, shift work sleep disorder, and jet lag treatment guides.
Frequently Asked Questions
Am I just a night owl or do I have a disorder?
If preference doesn’t cause problems, just preference. Disorder if causing impairment.
Does light therapy actually work?
Yes, evidence-based for several circadian disorders.
How much melatonin should I take?
For circadian shifting, 0.3-1 mg often more effective than higher doses.
Can I retrain my circadian rhythm?
Yes with consistent light, schedule, and possibly melatonin timing.
Should I see a sleep specialist?
For severe or persistent circadian issues, yes.
The bottom line on circadian rhythm disorders
Multiple types with specific treatments. Light therapy and properly timed melatonin effective. Discuss with sleep specialist for significant disorders.