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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.
Excessive daytime sleepiness: A neurological disorder in which there is a sudden recurrent uncontrollable compulsion to sleep. Excessive daytime sleepiness is also known as narcolepsy. The condition is often associated with: 1  Cataplexy -- a sudden loss of muscle tone and paralysis of voluntary muscles associated with a strong emotion. 2  Sleep paralysis -- immobility of the body that occurs in the transition from sleep to wakefulness. 3  Hypnagogic hallucinations -- pre-sleep dreams.