Translations:Unstable adaptation/6/en

Sleep needs can be increased temporarily, usually as an effect of needed physical recovery. Such cases include increased physical activity and some substances such as cannabis or alcohol. External events such as these sometimes may significantly increase sleep needed (mostly SWS) which can shake the adapted state with increasing intensity inversely proportional to the total sleep time of the schedule. This is the main reason why schedules with at least 3 sleep cycles are commonly recommended in the polyphasic community for those with intense physical activity, as they more likely guarantee the possibility to accommodate enough SWS in core(s).