Changes

As with a non-reducing biphasic schedule, E1 does offer various tools to play with. The nap can be anywhere from '''10m to ~30m''' since '''E1 is focused on a short daytime nap''' (<u>not to be confused with Siesta</u>, whose daytime sleep is often long). The nap duration can change from day to day, and can start at different hours each day if desired. Similarly, the core duration has no fixed duration and sleepers should rely on natural wakes for both sleep blocks. This scheduling variant can be consistent everyday (sleeping by the minute), or slightly different sleep times each day from day 1 of adaptation (it is recommended that the core should should not be more flexible than a 1h window when first adapting, meaning the window should be limited to sleeping ~1h later or earlier than the original time, to keep a consistent circadian rhythm). Thanks to the flexible nature of the nap, it is then necessary for sleepers to '''recognize the time they are naturally tired or drowsy in the day''' to place the nap accordingly; if the timetable does not allow for a large flexibility of the nap, then a smaller nap window can be chosen with a more consistent nap time daily. Most importantly, '''late naps (past ~5-6 PM)''' should be avoided or considered carefully because it may interfere with the core at night, because total sleep time is already high.   

As with a non-reducing biphasic schedule, E1 does offer various tools to play with. The nap can be anywhere from '''10m to ~30m''' since '''E1 is focused on a short daytime nap''' (<u>not to be confused with Siesta</u>, whose daytime sleep is often long). The nap duration can change from day to day, and can start at different hours each day if desired. Similarly, the core duration has no fixed duration and sleepers should rely on natural wakes for both sleep blocks. This scheduling variant can be consistent everyday (sleeping by the minute), or slightly different sleep times each day from day 1 of adaptation (it is recommended that the core should should not be more flexible than a 1h window when first adapting, meaning the window should be limited to sleeping ~1h later or earlier than the original time, to keep a consistent circadian rhythm). Thanks to the flexible nature of the nap, it is then necessary for sleepers to '''recognize the time they are naturally tired or drowsy in the day''' to place the nap accordingly; if the timetable does not allow for a large flexibility of the nap, then a smaller nap window can be chosen with a more consistent nap time daily. Most importantly, '''late naps (past ~5-6 PM)''' should be avoided or considered carefully because it may interfere with the core at night, because total sleep time is already high.   

Recently, there has been some success of this variant with very young teenagers who pursue a safe and easiest way to partake in polyphasic sleeping with the option for a daytime nap to train napping skills. This usually serves as a groundwork for them to move to a more difficult schedule when time allows. A great advantage non-reducing E1 has over its counterpart Siesta is that the short daytime nap is very easy to schedule around meal times and social events, and usually not long enough to avoid being interrupted by daytime commitments.   

Recently, there has been some success of this variant with very young teenagers who pursue a safe and easiest way to partake in polyphasic sleeping with the option for a daytime nap to train napping skills. This usually serves as a groundwork for them to move to a more difficult schedule when time allows. A great advantage non-reducing E1 has over its counterpart Siesta is that the short daytime nap is very easy to schedule around meal times and social events, and usually short enough to avoid being interrupted by daytime commitments.   

== Lifestyle consideration ==

== Lifestyle consideration ==