Changes in sleep patterns caused by shift work and traffic noise
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TL;DR
Day sleep of shift workers has been studied with polygraphic techniques by several research groups and a general similarity in the sequence of sleep stages in both conditions is found.
Abstract
Day sleep of shift workers has been studied with polygraphic techniques by several research groups (1, 3, 4, 6, 7, 8, 11, 13). The comparison between day sleep after a night shift and night sleep after a day shift has produced a number of results, which seem to be generally accepted. These are: a general similarity in the sequence of sleep stages in both conditions (1, 7, 8, 11, 12, 13), a shortened sleep latency (1, 3, 7, 11) and a shortened REM latency (2, 13) in day sleep, no reduction of slow wave sleep after a night shift (2, 3, 4, 7, 10, 11, 13).