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Preoptic area multiple unit activity and LH release during the sleep cycle of the rat.

Medial preoptic area (MPOA) multiple unit activity and EEG from the cerebral cortex, dorsal hippocampus, olfactory bulbs and caudal pontine reticular nucleus were recorded in unanesthetized, unrestrained rats possessing indwelling cannulas in the aortic arch. The rats were housed in glass chromatography jars inside a soundproof, light—controlled (14 hr light, 10 hr darkness) electrically shielded chamber. There were two rats in the recording chamber at all times. After a two—week habituation period the studies were begun. Blood samples were removed through the cannulas during waking, slow wave sleep (SWS) and paradoxical sleep (PS) at various times during the estrous cycle. All three samples (0.3 ml) were removed within a one—hr period. Blood LH levels were the lowest during SWS and increased several fold during PS and waking. These differences were observable during all stages of the estrous cycle. Integrated multiple unit activity from the MPOA was higher during PS than during SWS or waking. Levels of a...