MSLT - MWT

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MSLT - MWT
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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)

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MSLT Procedure
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MSLT Results Table
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Sleep Latency Data Plot
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Calculation of Mean Sleep Latency
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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.

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MSLT findings

• Mean sleep latency
• normal is gt 10 minutes
• 5-10 minutes is gray zone
• lt5 minutes is pathological sleepiness
• REM-onset sleep periods
• normal is lt 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