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Russian society under the rule of Nicholas I after December 1825 became
Sleep Stage
Describes the differing phases of sleep an individual transitions through, including REM (rapid eye movement) and various levels of non-REM sleep.
Total Sleep Time
The total amount of time spent sleeping during a typical sleep period, often measured in hours.
Sleep Patterns
The natural or habitual timing, duration, and quality of sleep, including cycles of REM and non-REM sleep.
Slow-wave Sleep
A deep phase of sleep known for its slow brain waves, considered critical for restorative sleep and memory consolidation.
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