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Which of the following is not a chemical barrier
Delayed Sleep Phase Syndrome
This syndrome is a circadian rhythm disorder where an individual's sleep is delayed by two or more hours, causing difficulty in waking up at conventional times.
Circadian Rhythms
Biological processes that display an endogenous, entrainable oscillation of about 24 hours, regulating the sleep-wake cycle among other bodily functions.
Advanced Sleep Phase Syndrome
A circadian rhythm disorder characterized by earlier than desired sleep onset and wake times, often resulting in evening sleepiness and morning alertness.
Biological Rhythm
Natural cycles of physical, emotional or mental activity in living beings, often aligned with daily, tidal, seasonal, or lunar cycles.
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