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[[File:E1-extended.png|center|thumb|E1-extended]]
[[File:E1-extended.png|center|thumb|E1-extended]]
The extended version is the usual recommendation for sleepers who are younger than 16 years old, or even 18+ years old who have a highly physically active lifestyle, a high sleep requirement and/or scheduling constraints (e.g, long wake gap from 9 AM to 5 PM). For a 9-hour monophasic sleeper, this variant still offers a decent amount of sleep cut, requiring only one nap to make the schedule work. With a lot of sleep in stock, the extended version allows for more versatility in the placement of nap times. Because most, if not all of the vital sleep stages have been covered in the core, the nap mostly serves to give some '''alertness boost''' (NREM2) or probably some amount of REM sleep to improve learning and memory. The nap can then be placed in later hours of the day (e.g, 4-5:30 PM). However, because of a high total sleep, it may take more time to finally be able to fall asleep in the nap effectively than on other reducing schedules because of an overall lower sleep pressure. The adaptation to E1-extended may last just as long as the regular version, albeit a much milder adaptation (and possibly a '''silent Stage 3''', with no signs of severe sleep deprivation symptoms or crippled productivity as seen on other more reducing schedules) that has been observed in successful adaptations. Picking this variant as a result may give the benefit of potentially maximizing daily performances (physical and cognitive) at work and/or school even when adapting.
The extended version is the usual recommendation for sleepers who are younger than 16 years old, or even 18+ years old who have a highly physically active lifestyle, a high sleep requirement and/or scheduling constraints (e.g, long wake gap from 9 AM to 5 PM). For a 9-hour monophasic sleeper, this variant still offers a decent amount of sleep cut, requiring only one nap to make the schedule work. With a lot of sleep in stock, the extended version allows for more versatility in the placement of nap times. Because most, if not all of the vital sleep stages have been covered in the core, the nap mostly serves to give some '''alertness boost''' (NREM2) or probably some amount of REM sleep to improve learning and memory. The nap can then be placed in later hours of the day (e.g, 4-5:30 PM). However, because of a high total sleep, it may take more time to finally be able to fall asleep in the nap effectively than on other reducing schedules because of an overall lower sleep pressure. The adaptation to E1-extended may last just as long as the regular version, albeit a much milder adaptation (and possibly a '''silent Stage 3''', with no signs of severe sleep deprivation symptoms or crippled productivity as seen on other more reducing schedules) that has been observed in successful adaptations. Picking this variant as a result may give the benefit of potentially maximizing daily performances (physical and cognitive) at work and/or school even when adapting.
== '''Lifestyle Consideration''' ==
Since E1 is overall a viable schedule to prepare polyphasic sleepers for more advanced schedules with the necessary napping skills to master the daytime nap, it does benefit a vast array of lifestyles. Its biphasic nature allows for long wake gaps between the nap and the core, and the nap can be fitted into several occupations, including the mainstream 9-to-5 ones. The nap can also be scheduled around noon in between any breaks or after work, before an exercising session. Because of the short nap duration, it becomes possible to sustain the schedule long term, as the nap is not as long as a core (at least 90m) to be interrupted by daytime commitments. After adaptation, the nap can become '''flexible by up to 2h''' (earlier and later than the original sleep time).
