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added stage 2 and 3
The duration of Stage 1 is shorter for the schedules with a low total sleep time or for individuals with preexisting sleep debt. This doesn't shorten the whole adaptation process though, usually just making Stage 3 and 4 longer. Insomniacs might find skipping this stage helpful since it's much easier to fall asleep on the later stages, but generally this isn't recommended. The benefit of falling asleep faster doesn't compensate the higher risk of oversleeping and longer period of having intense sleep deprivation symptoms.
The duration of Stage 1 is shorter for the schedules with a low total sleep time or for individuals with preexisting sleep debt. This doesn't shorten the whole adaptation process though, usually just making Stage 3 and 4 longer. Insomniacs might find skipping this stage helpful since it's much easier to fall asleep on the later stages, but generally this isn't recommended. The benefit of falling asleep faster doesn't compensate the higher risk of oversleeping and longer period of having intense sleep deprivation symptoms.
== Stage 2 ==
This stage is mostly similar to the first one and can be distinguished from it by the sleep deprivation symptoms, which become more apparent, albeit not intense yet. Random tiredness dips start to occur more often throughout the day. Falling asleep usually becomes a bit easier, as sleep pressure keeps increasing. Similarly to Stage 1, this stage is shorter on the difficult schedules.
== Stage 3 ==
By Stage 3, sleep debt accumulates enough to cause intense sleep deprivation symptoms, which often leads to oversleeps or noticeable difficulty of staying awake. The intensity of this stage depends on the schedule though, and might be very mild for [[non-reducing]] schedules or insanely hard for the ones with an extreme sleep reduction. Stages repartitioning starts by this stage, so the sleep structure might be messy temporarily. It's much easier to fall asleep and much more difficult to wake up, wakes often are accompanied by a strong sleep inertia.
This stage is longer for the schedules with a low total sleep time or for the attempts with pre-existing sleep deprivation. Sometimes Stage 3 starts after only a few days passed considering these condition. Therefore it's recommended to go through a [[recovery]] process to reduce sleep debt before attempting a new schedule.
== Stage 4 ==
After sleep is efficiently repartitioned and the...
