Sleep onset latency

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List of terms related to Sleep onset latency

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview[edit | edit source]

In sleep science, sleep onset latency (SOL) is the length of time that it takes to accomplish the transition from full wakefulness to sleep, normally to the lightest sleep stage non-REM.^[1]

Daytime tests, such as the MSLT, measure sleep onset latency as an indication of excessive daytime sleepiness (EDS). A sleep onset latency of 15-25 minutes in a person's biological daytime is considered normal. A shorter latency is likely a sign that a person suffers from sleep deprivation. A sleep onset latency of less than five minutes indicates either very unhealthy daytime sleepiness or one of several sleep disorders, for example narcolepsy.

A long SOL at bedtime can be an indication of a sleep disorder, including but not limited to insomnia.

References[edit | edit source]

↑ Respironics.com Glossary

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[1] Respironics.com Glossary

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