Clinical neuropharmacology of sleep.

Sleep affects, and is in turn affected by, cardiovascular, thermal, respiratory, endocrine, circadian, and sensory processes. Integrative areas of the basal forebrain play a crucial role, as does interaction with cholinergic and aminergic areas of the brain stem. AD, which affects a wide range of structures and functions, alters sleep in a manner distinguishable from depressive pseudodementia and may involve changes in autonomic function. Sleep apnea occurs with a high incidence in patients with AD, and the possibility should be explored that treating sleep apnea might be beneficial to their cognitive and affective status. Long-acting hypnotics can adversely affect daytime functioning. This might occur because of either direct effects on structures mediating sleep and cognition or, alternatively, exacerbation of sleep-related respiratory dysfunction. Studies of the benzodiazepine receptor complex may lead to the development of new drugs to aid sleep and wakefulness.