Everyman

https://www.polyphasicsociety.com/polyphasic-sleep/overviews/everyman/

Articles

https://www.supermemo.com/en/articles/sleep

All forms of sleep control with an alarm clock will increase the overall demand for sleep. This means that:

If you use an alarm clock, either:

Artificial sleep schedules will dramatically reduce your mental capacity. A healthy individual in normal conditions will find it difficult to fall asleep 4 hours after the main sleep episode unless that episode was unnaturally cut with an alarm clock resulting in sleep deprivation.