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Daytime sleepiness in Parkinson's disease. We describe multiple sleep latency test (MSLT) results in 27 adult patients with idiopathic Parkinson's disease (PD). Pathological sleepiness (i.e. mean sleep latency </=5 min) was common (40 of 134 nap opportunities), and sleep-onset REM periods were also observed (13 of 134 nap opportunities). These findings bore little relationship to disease specific variables (e.g. level of disability, medication use), or sleep architecture measures (e.g. total sleep time, sleep stage percentage's). Our findings speak against a simple association of excessive sleepiness and the quality and quantity of prior night's sleep, but rather, argue for primary impairments of waking arousal and REM-sleep expression in a sizeable subpopulation of PD patients. J Sleep Res 2000 Mar;9(1):63-69 Rye DB, Bliwise DL, Dihenia B, Gurecki P Sleep Disorders Center, Emory University Medical School, Atlanta, Georgia 30329, USA. PMID: 10733691 <http://www.ncbi.nlm.nih.gov:80/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10733691&dopt=Abstract> janet paterson 53 now / 41 dx / 37 onset a new voice: http://www.geocities.com/janet313/ 613 256 8340 PO Box 171 Almonte Ontario Canada K0A 1A0