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I detect that the findings from the study of sleep disorders have shifted over the last ten years or so in a rather fundamental way.  Previously, the belief was that sleep lost to inadequate sleep each night was cumulative, and would form a so called “sleep deficit.”  The sleep deficit would make it harder to stay awake during the normal waking hours, and would continue to do so until it was paid back by getting enough extra sleep to offset it.  So the fundamental cause was a loss of sleep for whatever reason.  A person could suffer from this no matter what time of the day or night they slept. Now, the thinking seems to have shifted to the premise that night shift work places the body out of phase with the circadian rhythm, and this has several negative health effects including insomnia.  The loss of sleep due to insomnia then causes fatigue during the waking hours.  So now the fundamental cause is nightshift work.  Most interestingly, this seemingly revised definition of sleep disorders makes the problem much harder to remedy.
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