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Wake after sleep onset (WASO) refers to periods of wakefulness occurring after defined sleep onset. This parameter measures wakefulness, excluding the wakefulness occurring before sleep onset. WASO time is a better reflection of sleep fragmentation.<ref name="Shrivastava" />
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WASO (wake after sleep onset) is defined as an unwanted wake or waking period after sleep onset. By definition, sleep must continue after the wake in order for it to count as a WASO. A wake after sleep onset, after which sleep does not continue, is called a [[premature wake]].
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== Cause ==
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WASOs occur more frequently during polyphasic adaptation, and are thought to be caused by the brain figuring out the new behavioral state times. In this framework, they are thought to cause no problems and are viewed as a part of polyphasic adaptation.
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In addition, there are people with the natural tendency to wake up at night, staying awake for 2-3 hours, and then falling back asleep. People experiencing this frequently are naturally inclined to dual core schedules. In addition, it has been observed that humans automatically develop a segmented sleep schedule, without the need for alarms or other restrictions, if the duration of the [[dark period]] is about 14h long.
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Furthermore, WASOs can be caused by bad sleep hygiene, including caffeine consumption, as well as by advanced age. 
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== Effects ==
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Typically, WASOs reduce sleep quality dramatically, making them a frequently used parameter for sleep quality in scientific research. Nevertheless, WASOs can cause the opposite effect, namely better sleep quality, if the gap between the WASO and the next sleep onset is 2-3h long, and only if the [[dark period]] is not interrupted and sleep is not restricted by an alarm.
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== Treatment ==
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== Conditions ==
 
== Conditions ==
confirmed, translator
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