Wikipedia: Free-running sleep

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Sleep that is not artificially regulated. Free running sleep is a form of chronotherapy? that can be used in curing selected [sleep disorders]?. Most of people in industrial world are not able or cannot afford free-running sleep. Only a small proportion of population can sleep in a perfect 24 hours cycle and in synchrony with duties such as job and family. The most typical violation of the free-running sleep is the use of an alarm clock. The other violation is going to sleep too late in reference to one's natural bed-time hour. Going to sleep very late in circumstances of reduced sleepiness does not violate free-running sleep. Going to sleep too early (e.g. to force longer sleep before early arising) may also disturb free-running sleep cycle.

Free-running sleep is sleep that is not artificially regulated. It is used as a form of chronotherapy? that can help to cure some [sleep disorders]?. Most people in the industrial world cannot afford free-running sleep. Only a small part of the population can sleep in a perfect 24 hour cycle and in synchrony with the schedules demanded by work and family. The most typical violation of free-running sleep is the use of an alarm clock. Another violation is staying awake past one's accustomed bedtime in spite of drowsiness. (Staying up late when one is not sleepy does not violate free-running sleep.) Going to sleep too early (e.g. to force longer sleep before early arising) may also disturb the free-running sleep cycle.