Changes

Recently, a '''new''' core length variant (6.5h core) has been proposed and has been delivering '''solid adaptation results''', even though only few sleepers have decided on this variant. With the idea that SWS mostly occurs in the first half of the night, and REM dominates the second half, after the 6h mark (which is the end of the default E1 core), there should be very limited, if not none, SWS. This will open up for more REM sleep and/or NREM2 to get into the core, to boost alertness and provide a better opportunity to match personal REM requirement on monophasic.  Similar to a 5h core (seen on Siesta and some Everyman variants), the +30m addition to the core is also considered a '''statistically likely REM period''' on a 6.5h core.   

Recently, a '''new''' core length variant (6.5h core) has been proposed and has been delivering '''solid adaptation results''', even though only few sleepers have decided on this variant. With the idea that SWS mostly occurs in the first half of the night, and REM dominates the second half, after the 6h mark (which is the end of the default E1 core), there should be very limited, if not none, SWS. This will open up for more REM sleep and/or NREM2 to get into the core, to boost alertness and provide a better opportunity to match personal REM requirement on monophasic.  Similar to a 5h core (seen on Siesta and some Everyman variants), the +30m addition to the core is also considered a '''statistically likely REM period''' on a 6.5h core.   

Individuals with slightly higher REM sleep than usual (> 100m each day) can attempt this variant. People with overall higher sleep need, or close to adulthood can also pick this variant for a closer total sleep to recommended monophasic baseline. A 6.5h core is also a strong compromise between the potentially difficult 6h core and the lengthy 7.5h core which offers much less sleep reduction. Despite the promising adaptation results, more data samples need to be collected for this E1 variant to discover any potential weaknesses it may have, however.  

Individuals with slightly higher REM sleep than usual (> 100m each day) can attempt this variant. People with overall higher sleep need, or close to adulthood can also pick this variant for a closer total sleep to recommended monophasic baseline. A 6.5h core is also a strong compromise between the potentially difficult 6h core and the lengthy 7.5h core which offers much less sleep reduction. The nap on this variant can be scheduled later if desired, because the extra 30 minutes provide more alertness sustaining than a 6h core. However, like other variants, the nap should not be later than 5 PM. Despite the promising adaptation results, more data samples need to be collected for this E1 variant to discover any potential weaknesses it may have, however.  

=== Early core ===

=== Early core ===