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Polyphasic sleep schedules usually become flexible after adaptation. The potential extent of one's flexing ranges and frequency depends on the scheduled total sleep time and the stability of their adaptation. Schedules with lower total sleep time are generally are much less flexible than schedules with higher total sleep time, as flexing is known to decrease sleep quality which is unacceptable for the schedules with extreme compression. However, this varies greatly from person to person based on sleep needs, duration of stable adaptation, and experience with flexing. When sleep is flexed too often and/or too far, the adaptation can be destabilized or even ruined if the compression cannot be maintained anymore.

Polyphasic sleep schedules usually become flexible after adaptation. The potential extent of one's flexing ranges and frequency depends on the scheduled total sleep time and the stability of their adaptation. Schedules with lower total sleep time are generally much less flexible than schedules with higher total sleep time, as flexing is known to decrease sleep quality which is unacceptable for the schedules with extreme compression. However, this varies greatly from person to person based on sleep needs, duration of stable adaptation, and experience with flexing. When sleep is flexed too often and/or too far, the adaptation can be destabilized or even ruined if the compression cannot be maintained anymore.

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