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=== 3.5h core ===
 
=== 3.5h core ===
 
[[File:Slightly longer core.png|thumb|E3 with a 3.5h core|alt=]]
 
[[File:Slightly longer core.png|thumb|E3 with a 3.5h core|alt=]]
Nowadays, this core length has been '''more commonly used''' for an E3 adaptation rather than the 3h core. The total sleep is similar to [[Triphasic]], hovering around a more comfortable sleep total for experienced or highly motivated attempters. The same principles that apply to the 3h core also apply to a 3.5h core. The core sleep should not start any later than 10-10:30 PM, to retain sufficient amount of SWS. If all SWS has been accounted for, the +30m from 3-3.5h mark can give more light sleep or REM sleep, to match personal REM baseline more comfortably. This is also a core duration that is popularly used in [[Segmented]] sleep and scheduled in the SWS peak for the same purpose. The naps are scheduled in a similar manner. It ''may'' be possible to '''gradually''' '''transition from Segmented sleep''' (with a 3.5h first core), a scheme proposed by '''[[Polyphasic Society]]''' to get to E3, but it is unknown if anyone has been able to pull this off.  
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The same principles that apply to the 3h core also apply to a 3.5h core. The core sleep still should start by 22-23 to retain a sufficient amount of SWS. If all SWS has been accounted for, the additional 30 minutes will provide REM and/or light sleep, which may help with either gaining enough REM or sustaining wakefulness. This is also a core duration that is popularly used in [[Segmented]] sleep and scheduled in the SWS peak for the same purpose. The naps should be placed in the same way as the standard schedule.
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The benefits of this variant is the '''flexibility''' of the core sleep after adaptation (~15-30m earlier or later than the original time should be realistic), and the flexibility of the last nap, or the second nap as well. Contrary to other polyphasic schedules with 4-4.5h total sleep, this 3.5h core version seems to be the most flexible. However, adaptation remains very punishing for any oversleeps as long as ~1h at least. The exhausting process of repartitioning will also ramp up around the second or third week. Those who want to start a first polyphasic adaptation should aim for this variant to stay at a safer amount of total sleep, and a somewhat milder adaptation than the original version.  
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The benefits of this variant is the flexibility of the naps and cores. Out of all polyphasic schedules with 4-4.5h total sleep ("Hard" and "Very Hard" category), this schedule is the most flexible.  
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However, adaptation remains difficult, and the exhausting process of repartitioning will cover the second or third week. Beginners aiming for this variant should start at a safer amount of total sleep, such as with [[E2]] or the [[#Extended|extended]] variant.
    
=== Extended ===
 
=== Extended ===
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