We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleInsomnia in Parkinson’s disease: frequency and progression over timeAuthorsGjerstad, M D; Wentzel-Larsen, T; Aarsland, D; Larsen, J PPublicationJournal of Neurology, Neurosurgery, & Psychiatry (JNNP), 2007, Vol 78, Issue 5, p476ISSN0022-3050Publication typearticle