Abstract
A growing literature suggests that the basal forebrain may contain structures involved in the regulation of sleep. As part of a series of studies designed to locate the site(s) of hypnotic action of benzodiazepines, we have injected triazolam into the medial preoptic area (MPA) of the hypothalamus of rats. Total sleep time was increased, due primarily to an increase in non-rapid eye movement (non-REM) sleep and a trend toward a decrease in intermittent waking time. A previous study from this laboratory reported that injections into the raphe nucleus decreased sleep, whereas injections at adjacent sites were without effect. These studies indicate the selectivity with which different brain regions respond to triazolam in terms of actions on sleep.
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