Circadian Rhythm Disorders
Delayed and advanced sleep phase disorders, shift work disorder, jet lag, and non-24-hour sleep-wake disorder — how the body clock drifts out of sync and how to reset it.
New here? Read these in order
- 1Circadian Rhythm Explained: Your Body's Internal ClockHow the body clock works, before the ways it can go wrong
- 2Delayed Sleep Phase Syndrome: A Comprehensive Patient GuideThe most common circadian disorder: the night owl pattern
- 3Advanced Sleep Phase Disorder: When You Fall Asleep Too EarlyThe early bird mirror image
- 4Light Therapy for Circadian Rhythm Disorders: A Practical GuideThe treatment most of these disorders share
- 5Non-24-Hour Sleep-Wake Disorder: When the Body Clock Drifts DailyWhen the clock drifts later every day
- 6Jet Lag Disorder: Why It Happens and How to Beat It FasterThe temporary version, and how to recover faster
Light Therapy for Circadian Rhythm Disorders: A Practical Guide
How to use bright light to reset your body clock — lux, timing, duration, and condition-by-condition protocols for DSPS, ASPD, shift work, jet lag, and SAD.
Advanced Sleep Phase Disorder: When You Fall Asleep Too Early
Advanced sleep-wake phase disorder (ASWPD): why some people fall asleep in early evening and wake before dawn, the genetics behind it, and treatment options.
Delayed Sleep Phase Syndrome: A Comprehensive Patient Guide
Delayed sleep-wake phase disorder (DSPS/DSWPD): causes, symptoms, the body clock science, and evidence-based treatment with light and melatonin.
Irregular Sleep-Wake Rhythm Disorder: Sleep Without a Schedule
Irregular sleep-wake rhythm disorder — sleep fragmented into multiple short bouts across 24 hours, its link to dementia, and evidence-based management.
Jet Lag Disorder: Why It Happens and How to Beat It Faster
The science of jet lag and evidence-based strategies — strategic light exposure, low-dose melatonin, and schedule planning for east and westbound travel.
Non-24-Hour Sleep-Wake Disorder: When the Body Clock Drifts Daily
Non-24-hour sleep-wake rhythm disorder (N24) — free-running circadian rhythm in blind and sighted people, symptoms, diagnosis, and FDA-approved treatment.
Shift Work Disorder: Surviving Nights and Rotating Shifts
Shift work disorder explained — the science of working against your body clock, health risks, and evidence-based strategies for night and rotating shifts.