Sleep disorders, such as insomnia, circadian rhythm disturbances, obstructive sleep apnea, and rapid eye movement (REM) sleep behavior disorder (RBD) are common in healthy older adults and even more so in older patients with dementia. The quest for a good night sleep is truly life-long, with up to 50% of older Americans suffering from chronic sleep complaints, including difficulty with sleep initiation, decreased total sleep time, increased night-time awakenings, increased daytime napping, and increased early morning awakenings. The Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV) describes dementia as a progressive cognitive disorder composed of memory impairment in addition to at least one other cognitive disturbance, not exclusively during the course of a delirium. Parkinson's plus syndromes are neurodegenerative diseases which cause Parkinsonism plus symptoms such as autonomic dysfunction, ataxia, eye movement abnormalities, apraxia, early falls, or dementia.