What are sleep disorders related to circadian rhythm?
Short Answer
Circadian rhythm sleep-wake disorders are problems with sleep timing, not sleep ability—your internal clock is misaligned with your schedule. Examples include delayed sleep phase, advanced sleep phase, shift work disorder, jet lag, and non-24-hour disorder.
Why This Matters
This matters because treating a timing disorder like insomnia often fails and results in unnecessary medication use. Misalignment leads to poor sleep at the “wrong” times and sleepiness at the “wrong” times, causing chronic fatigue and mood disruption. Identifying the pattern leads to targeted fixes using light, schedule consistency, and sometimes melatonin timing.
Where This Changes
Chronotype and environment matter: bright mornings, dim evenings, and consistent wake times can shift many cases. For shift workers, perfect alignment may be impossible, so the goal becomes risk reduction and protected sleep windows.