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Sleep onset latency. 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 of the non-REM sleep stages. MSLT Scores.
Sleep cycles subsequent to the first one in a night's sleep typically feature less slow-wave sleep, as Stages 3 and 4 shorten. Slow-wave, deep sleep is longest early in a night's sleep. Generally, sleep disorders affect the quality, duration, and onset of sleep.