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Multiple Choice

WASO measures what in sleep research?

WASO, or wake after sleep onset, reflects how much time a person stays awake after they’ve fallen asleep. It sums up awakenings that occur during the main sleep period, capturing sleep fragmentation and maintenance problems. This is different from total sleep time (which is how long you’re actually asleep) and from sleep onset latency (the time it takes to fall asleep). It also isn’t the same as sleep efficiency, which is the proportion of time in bed spent asleep; high WASO tends to lower that efficiency. In short, WASO is the amount of wake time after sleep has started.

WASO, or wake after sleep onset, reflects how much time a person stays awake after they’ve fallen asleep. It sums up awakenings that occur during the main sleep period, capturing sleep fragmentation and maintenance problems. This is different from total sleep time (which is how long you’re actually asleep) and from sleep onset latency (the time it takes to fall asleep). It also isn’t the same as sleep efficiency, which is the proportion of time in bed spent asleep; high WASO tends to lower that efficiency. In short, WASO is the amount of wake time after sleep has started.