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If the length of sleep is constant in free running sleep, why do sleep logs of DSPS patients show a clear relationship between the sleep onset hour and the sleep length?

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If the length of sleep is constant in free running sleep, why do sleep logs of DSPS patients show a clear relationship between the sleep onset hour and the sleep length?

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Such a relationship will only show if the rhythm isn’t a perfectly free running rhythm. Rarely are patients able to disconnect their sleep needs with their need to perform their daily duties in the society. As a result, DSPS patient who claim to free run will often learn tricks to “manipulate” their sleeping rhythm (e.g. trying to accelerate the phase shift before an important appointment, etc.). In an undisturbed free running rhythm, the length of sleep should remain constant.

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