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SWS rebound is lengthening and increasing frequency and depth of [[wikipedia:Slow-wave_sleep|SWS]] sleep which occurs after periods of [[wikipedia:Sleep_deprivation|sleep deprivation]]. A longer duration of time spent in SWS, as well as a significant shortening of [[Scheduling overview#Sleep stages|NREM3]] and NREM4 latencies, are common signs of SWS rebound, as a study on a selective slow-wave sleep deprivation has shown.<ref>Ferrara M, De Gennaro L, Bertini M. Selective slow-wave sleep (SWS) deprivation and SWS rebound: do we need a fixed SWS amount per night. Sleep Res Online. 1999;2(1):15–9. - PubMed</ref>

'''SWS (Slow-wave sleep) rebound''' is the lengthening and increase in frequency and depth of [[wikipedia:Slow-wave_sleep|SWS]] after periods of [[wikipedia:Sleep_deprivation|sleep deprivation]]. A longer duration of time spent in SWS, as well as a significant shortening of [[Scheduling overview#Sleep stages|NREM3]] latency are common signs of an SWS rebound, as a study on a selective slow-wave sleep deprivation has shown.<ref name="swsd" />

 

== Sleep-onset SWS ==

== Sleep-onset SWS ==

{{Main|SOSWS}}

{{Main|SOSWS}}

The slow-wave sleep latency shortens, which is also known as SOSWS or sleep-onset SWS. 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]].

Normally, SWS only occurs around 20-30 minutes into a sleep cycle. However, during the process of SWS rebound, SWS latency shortens, meaning that the body reaches SWS sooner. This phenomenon is known as '''sleep-onset SWS''', or '''SOSWS'''.

 

== References ==

== References ==

<references />

<ref name="swsd">{{cite journal |vauthors=Ferrara M, De Gennaro L, Bertini M |date=1999 |title=Selective slow-wave sleep (SWS) deprivation and SWS rebound: do we need a fixed SWS amount per night |journal=Sleep research online |volume=2 |issue=1 |pages=15-19}}</ref>