The following are the sleep/wake patterns of a person who works days and who has no sleep-related problems, compared with those of a shiftworker.
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In the normal sleeper, you can see all brain and physical activity is much less at night than it is during the day and is also regular, happening at the same time every night. However, with the shiftworker, his brain/body activity is very strong at night he doesn't get regular rest and his sleep patterns are disrupted.
