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Sleep-onset SWS (SOSWS) is a short [[wikipedia:Slow-wave_sleep|slow-wave-sleep]] latency, or an abnormally rapid transition from wakefulness to SWS, almost fully skipping the period of [[wikipedia:Non-rapid_eye_movement_sleep|light sleep]] that normally characterizes the beginning of the sleep period.
== Mechanism ==
After periods of [[wikipedia:Sleep_deprivation|sleep deprivation]], and slow-wave-sleep deprivation in particular, a significant shortening of [[Scheduling overview#Sleep stages|NREM3]] and NREM4 latencies is usually expected.<1> Similarly to [[SOREM|sleep onset REM]]<2>, SWS latency is <15 minutes in this case.
== Application to polyphasic sleep ==
Generally polyphasic sleep schedules, which contain at least 3 full [[wikipedia:Sleep_cycle|sleep cycles]] in [[Cores|core(-s)]], rarely cause significant SWS loss. SOSWS is more common for extreme schedules, such as the [[Nap only|nap-only]] line. This mechanism causes entering SWS almost immediately, which allows to get SWS-filled [[naps]].
== References ==
== Mechanism ==
After periods of [[wikipedia:Sleep_deprivation|sleep deprivation]], and slow-wave-sleep deprivation in particular, a significant shortening of [[Scheduling overview#Sleep stages|NREM3]] and NREM4 latencies is usually expected.<1> Similarly to [[SOREM|sleep onset REM]]<2>, SWS latency is <15 minutes in this case.
== Application to polyphasic sleep ==
Generally polyphasic sleep schedules, which contain at least 3 full [[wikipedia:Sleep_cycle|sleep cycles]] in [[Cores|core(-s)]], rarely cause significant SWS loss. SOSWS is more common for extreme schedules, such as the [[Nap only|nap-only]] line. This mechanism causes entering SWS almost immediately, which allows to get SWS-filled [[naps]].
== References ==
