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'''Consistency''' refers to the strictness in which sleepers follow their scheduled sleep timings. Most people are able to vary sleep times significantly on [[Monophasic]], with little to no ill effect. However, when adapting to a polyphasic schedule, especially a [[reducing]] one, sleep timings must be followed precisely. It is currently not clear as to exactly how strict it needs to be, but it has been suggested, both in [[Puredoxyk]]'s Uberman adaptations and the [[DST]] gradual adaptation experiment, that the body may be sensitive to timing changes as little as 5-10 minutes. It is therefore recommended to follow sleep timings as strictly as possible, with minimal variation on a day-to-day basis.
Consistency is necessary because adapting to reducing schedules requires [[repartitioning]], which is only possible when the sleep timings are stable. In contrary, there has been successful adaptations to [[non-reducing]] schedules without strict timings.
After adaptation, it is possible to also adapt to [[flexing]], in which one gradually learns to vary sleep times ''after'' first adapting to the schedule. The extent to which this is possible depends on the schedule and individual ability.