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- Sleep disruptions exist when sleep is insufficient to support adequate alertness, performance, and health, either because of reduced total sleep time or fragmentation of sleep by brief arousals.
- May be volitional or involuntary
- Acute sleep deprivation refers to no sleep or a reduction in the usual total sleep time, usually lasting one or two days.
- Chronic sleep deprivation (also called sleep restriction) exists when the individual routinely sleeps less than required for optimal functioning.