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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.
Insomnia can be grouped into primary and secondary, or comorbid, insomnia. Primary insomnia is a sleep disorder not attributable to a medical, psychiatric, or environmental cause. It is described as a complaint of prolonged sleep onset latency, disturbance of sleep maintenance, or the experience of non-refreshing sleep.nsomnia can be classified as transient, acute, or chronic. 1  Transient insomnia lasts for less than a week. 2  It can be caused by another disorder, by changes in the sleep environment, by the timing of sleep, severe depression, or by stress.