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.
| Minutes | Sleepiness |
|---|---|
| 0–5 | Severe |
| 5–10 | Troublesome |
| 10–15 | Manageable |
| 15–20 | Excellent |
Read more about Sleep Onset Latency: Sleep Latency Studies, Home Testing of Sleep Latency, Biomarkers of Sleepiness
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