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Sleep restriction refers to the intentional reduction of the amount of sleep an individual receives, typically below what is recommended for their age group.
The natural internal process that regulates our sleep-wake cycle, telling us when it's time to be awake or asleep.
A sleep disorder characterized by difficulty falling asleep or staying asleep, often resulting in reduced total sleep time.
A stage of sleep associated with vivid dreaming and rapid eye movements, important for emotional processing and memory consolidation.