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MSLT - MWT MSLT Protocol • Consider drug testing • Should follow an overnight PSG • 4 or 5 naps, 2 hours apart – naps last 20 minutes, or 15 minutes after onset of sleep (longest can be 35 mins) – unit of measure: • minutes to sleep onset (stage 1) • minutes to REM sleep onset (beginning with stage 1) MSLT Procedure MSLT Results Table Sleep Latency Data Plot Calculation of Mean Sleep Latency Sleepiness Index • Take total number of minutes of sleep latencies and subtract from 100 (if no sleep, the index is 0) • If only 4 naps are conducted, subtract total number of minutes of sleep latencies and subtract from 80. Divide the resulting number by 80 and multiply by 100. MSLT findings • Mean sleep latency – normal is > 10 minutes – 5-10 minutes is “gray zone” – <5 minutes is pathological sleepiness • REM-onset sleep periods – normal is < 2 – if there is only one, it is most likely to be in first nap – one SOREM obligates you to 5th nap or second SOREM