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It is possible that the adapted state is unstable or gets destabilized for a sleeper. Some events, injuries or substances can throw off the sleeper from being adapted in most cases. There are a few types of sleep destabilization or generally unstable adapted state, which are described below.
It is possible that the adapted state is unstable or gets destabilized for a sleeper. Some events, injuries or substances can throw off the sleeper from being adapted in most cases. There are a few types of sleep destabilization or generally unstable adapted state, which are described below.
== Too low total sleep time ==
== Low total sleep time ==
It is usually very difficult to adapt to [[Template:Polyphasic Sleep Schedules|schedules]] with a low total sleep time, since much more sleep compression should occur, leaving significantly much less light sleep. This makes the sleep schedule much less [[Flexing|flexible]] and generally unstable, because any event or substance, which temporarily increases sleep needed, can easily compromise adapted state. This is likely the main reason why [[long term]] polyphasic sleepers more often are those, who stay on a schedule, which reduce [[Non-reducing|little-to-no]] sleep, while most [[Nap only|nap-only]] adaptations.
Also, schedules, which reduce much sleep, require much denser blocks of sleep during the day because of the [[wake time reduction]], so shorter wake gaps are possible, which makes such schedules inconvenient for daily life and thus unstable long term.
== Increased sleep needs ==
Sleep needs can be increased temporarily, usually as an effect of needed physical recovery. Such cases include increased physical activity<ref>Erik Naylor, MS, Plamen D. Penev, MD, PhD, Larry Orbeta, BA, Imke Janssen, PhD, Rosemary Ortiz, Egidio F. Colecchia, MS, Moses Keng, MS, Sanford Finkel, MD, Phyllis C. Zee, MD, PhD (January 2000). ''[https://academic.oup.com/sleep/article/23/1/1/2749954 Daily Social and Physical Activity Increases Slow-Wave Sleep and Daytime Neuropsychological Performance in the Elderly.]'' Sleep, Volume 23, Issue 1, January 2000, Pages 1–9, <nowiki>https://doi.org/10.1093/sleep/23.1.1f</nowiki></ref><ref>Markus Dworak, Alfred Wiater, Dirk Alfer, Egon Stephan, Wildor Hollmann, Heiko K. Strüder (March 2008). ''[https://www.sciencedirect.com/science/article/abs/pii/S1389945707001815 Increased slow wave sleep and reduced stage 2 sleep in children depending on exercise intensity]''. Sleep Medicine, Volume 9, Issue 3, March 2008, Pages 266-272, https://doi.org/10.1016/j.sleep.2007.04.017</ref>, some substances, such as marijuana<ref>Barratt, E. S., Beaver, W., & White, R. (1974). ''[https://psycnet.apa.org/record/1974-24717-001 The effects of marijuana on human sleep patterns]''. Biological Psychiatry, 8(1), 47–54.</ref>
== Flexing ==
== References ==
<references />
