In sleep studies, WASO refers to which concept?

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Multiple Choice

In sleep studies, WASO refers to which concept?

Wake after sleep onset (WASO) measures the total time you are awake after you have fallen asleep, during the main sleep period. It reflects sleep continuity—the more awakenings or longer wake episodes after sleep begins, the higher the WASO. This is different from sleep onset latency, which is the time it takes to fall asleep, and from total sleep time, which is how long you were actually asleep overall. It also doesn’t include time spent awake before falling asleep. If you have several awakenings after sleep onset or long wake periods during the night, WASO increases, indicating more fragmented sleep. For example, if you fall asleep at 10:15 and accumulate 40 minutes of wakefulness after that initial sleep onset, WASO would be 40 minutes.

Wake after sleep onset (WASO) measures the total time you are awake after you have fallen asleep, during the main sleep period. It reflects sleep continuity—the more awakenings or longer wake episodes after sleep begins, the higher the WASO. This is different from sleep onset latency, which is the time it takes to fall asleep, and from total sleep time, which is how long you were actually asleep overall. It also doesn’t include time spent awake before falling asleep. If you have several awakenings after sleep onset or long wake periods during the night, WASO increases, indicating more fragmented sleep. For example, if you fall asleep at 10:15 and accumulate 40 minutes of wakefulness after that initial sleep onset, WASO would be 40 minutes.

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