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=== Short gaps between cores ===
 
=== Short gaps between cores ===
It was suggested that short gaps might be possible between cores if there is no SWS interruption. There were no attempts of adaptation to this schedule with the usage of EEG yet, so it's still unknown how sleep structure would be formed. It might happen that the interrupted sleep theory will be confirmed, if blocks of sleep have unpredictable and messed up structure. However, it is also possible that cores sleep structure will take a normal form, similar to the one for longer gaps.
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It was suggested that short gaps might be possible between cores if there is no SWS interruption. There were no attempts of adaptation to this schedule with the usage of EEG yet, so it's still unknown how sleep structure would be formed. It might happen that the interrupted sleep hypothesis will be confirmed, if blocks of sleep have unpredictable and messed up structure. However, it is also possible that cores sleep structure will take a normal form, similar to the one for longer gaps.
    
Short gap schedules usually don't have many advantages, since for many people it's difficult to return to sleep after a short gap, as not much sleep pressure is built. Also short gaps are noticeably less useful from the point of view of activities, because much less things can be done in a short period of time. They might have an advantage for those inclined to shorter wake gaps though. In the past, adults often slept in two distinct phases at night, bridged by an intervening period of wakefulness of approximately one hour<ref>Ekirch, A. Roger (2005). ''[https://archive.org/details/atdaysclose00arog_0 At Day's Close: Night in Times Past]''. W. W. Norton.</ref>, which also suggests somewhat short gaps are natural for human.
 
Short gap schedules usually don't have many advantages, since for many people it's difficult to return to sleep after a short gap, as not much sleep pressure is built. Also short gaps are noticeably less useful from the point of view of activities, because much less things can be done in a short period of time. They might have an advantage for those inclined to shorter wake gaps though. In the past, adults often slept in two distinct phases at night, bridged by an intervening period of wakefulness of approximately one hour<ref>Ekirch, A. Roger (2005). ''[https://archive.org/details/atdaysclose00arog_0 At Day's Close: Night in Times Past]''. W. W. Norton.</ref>, which also suggests somewhat short gaps are natural for human.
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