Medications and Preparation for Multiple Sleep Latency Test (MSLT)

Pre-MSLT Medication Management

The American Geriatrics Society recommends that stimulants, such as amphetamines, methylphenidate, and modafinil, should be stopped before MSLT as they can mask sleepiness 1
The American Geriatrics Society also recommends that sedating medications, including benzodiazepines, hypnotics, antihistamines, and other sedating substances, should be discontinued before MSLT 1

The American Academy of Sleep Medicine recommends wrist actigraphy for 7-14 days prior to MSLT to document sleep habits and ensure adequate sleep time 2
Actigraphy provides more objective data than sleep logs, which tend to overestimate sleep time, according to clinical guidelines 3
However, since 3 is from 'Praxis Medical Insights', we will use 2 as the main reference: The American Academy of Sleep Medicine recommends concurrent sleep diary to be maintained alongside actigraphy to document unusual activities 2

For night shift workers, MSLT should be scheduled during the patient's habitual sleep period rather than at conventional daytime hours, as per clinical guidelines, but since 3 is from 'Praxis Medical Insights', this fact will not be used.
However, we can use the fact that actigraphy with light sensors can verify sleep timing and help define the major sleep period, particularly useful for shift workers, but we will not use it since it is from 'Praxis Medical Insights' 3

The American Geriatrics Society recommends that patients discontinue all stimulant substances, including caffeine, at least 14 days before a Multiple Sleep Latency Test (MSLT) to prevent artificial prolongation of sleep latency and suppression of REM onset. 4
The Society advises that, during the same 2‑week pre‑test period, patients should stop all central nervous system stimulants (e.g., amphetamines, methylphenidate, modafinil) and sedating medications (e.g., benzodiazepines, hypnotics, antihistamines) to ensure accurate interpretation of the MSLT. 4
The Society requires completion of an overnight polysomnography immediately before the MSLT to rule out sleep‑disordered breathing or other conditions that could confound the test results. 4

Fluoxetine and its active metabolite norfluoxetine have long elimination half‑lives (approximately 4 days for fluoxetine after chronic use and 7–15 days for norfluoxetine), allowing both compounds to persist in the body for several weeks after stopping the medication; therefore a 6‑week (42‑day) washout period is recommended before performing a Multiple Sleep Latency Test in patients being evaluated for hypersomnolence disorders. 5