Changes

==Mechanism==

==Mechanism==

E4 keeps the same premises as other Everyman schedules, but under much harsher conditions. The [[Cores|core]] sleep, the small "nucleus" of the schedule, serves to provide a hopefully sufficient amount of [[wikipedia:SWS|SWS]], the deepest stage of sleep that is crucial for quality of life and well-being. The naps, as usual, will provide [[wikipedia:Rapid_eye_movement_sleep|REM]] sleep and traces of [[wikipedia:Non-rapid_eye_movement_sleep|light sleep]]. However, what works on its less extreme counterparts, [[E2]] and [[E3]] does not work the same on E4. The core sleep is simply '''not long enough''' to sustain a 90m SWS requirement each day, taking into account of transitional light sleep. Because of this reason, at least one nap will contain SWS, because SWS' homeostatic pressure can creep into any naps, especially the last nap on the schedule.  

E4 keeps the same premises as other Everyman schedules, but under much harsher conditions. The [[Cores|core]] sleep, the small "nucleus" of the schedule, serves to provide a hopefully sufficient amount of [[wikipedia:Slow-wave_sleep|SWS]], the deepest stage of sleep that is crucial for quality of life and well-being. The naps, as usual, will provide [[wikipedia:Rapid_eye_movement_sleep|REM]] sleep and traces of [[wikipedia:Non-rapid_eye_movement_sleep|light sleep]]. However, what works on its less extreme counterparts, [[E2]] and [[E3]] does not work the same on E4. The core sleep is simply '''not long enough''' to sustain a 90m SWS requirement each day, taking into account of transitional light sleep. Because of this reason, at least one nap will contain SWS, because SWS' homeostatic pressure can creep into any naps, especially the last nap on the schedule.  

To ensure the most amount of SWS, the core sleep is now placed '''at the heart of SWS peak''', ideally starting between 9 and 10 PM. Because the core sleep is much shorter than that of E3, the extra nap will be added to the schedule to balance the long wake gap between the end of the core and the nap around sunrise hours. In a way, E4 is basically [[DC3]] without the second core, as DC3's second core is also placed around the same time as E4's first nap. The overall schedule looks to be '''equidistant''', and there is a longer wake gap from the last nap of the day to the core. There is approximately 4 hours of wake gap between each nap, which ideally fits into the '''[[wikipedia:Basic_rest–activity_cycle|BRAC concept]]''' when scheduling (~4h rhythm). After all the naps have been taken, it supposedly becomes easier to stay awake in the afternoon and evening hours, hence the longer wake gap. The naps also take advantage of the common circadian spots for sleep - the first two are during [[graveyard hours]], which coincide with monophasic sleep time, while the third nap resembles a nap taken on a [[Biphasic|biphasic schedule]] ('''[[circadian nadir]] at noon'''), and the last nap is around ~'''4-5 PM''', when core body temperature reaches the maximum value, which is suitable for short sleep durations (to ease waking up).  

To ensure the most amount of SWS, the core sleep is now placed '''at the heart of SWS peak''', ideally starting between 9 and 10 PM. Because the core sleep is much shorter than that of E3, the extra nap will be added to the schedule to balance the long wake gap between the end of the core and the nap around sunrise hours. In a way, E4 is basically [[DC3]] without the second core, as DC3's second core is also placed around the same time as E4's first nap. The overall schedule looks to be '''equidistant''', and there is a longer wake gap from the last nap of the day to the core. There is approximately 4 hours of wake gap between each nap, which ideally fits into the '''[[wikipedia:Basic_rest–activity_cycle|BRAC concept]]''' when scheduling (~4h rhythm). After all the naps have been taken, it supposedly becomes easier to stay awake in the afternoon and evening hours, hence the longer wake gap. The naps also take advantage of the common circadian spots for sleep - the first two are during [[graveyard hours]], which coincide with monophasic sleep time, while the third nap resembles a nap taken on a [[Biphasic|biphasic schedule]] ('''[[circadian nadir]] at noon'''), and the last nap is around ~'''4-5 PM''', when core body temperature reaches the maximum value, which is suitable for short sleep durations (to ease waking up).