To fully benefit from the advantages of sleep, it is not enough to total a good number of hours: one must sleep in a regular and continuous manner to allow the brain to naturally pass through all of its cycles (deep sleep at the beginning of the night for physical regeneration, and REM sleep at the end of the night for memory and emotional balance).

noli's read

The assertion that each phase of sleep has a distinct role and occurs at specific times is validated by the consensus of the American Academy of Sleep Medicine. Indeed, deep sleep predominates at the beginning of the night, while REM sleep is concentrated in the second half of our rest. Interrupting or shifting one's nights disrupts this natural cycle, preventing the brain from completing these different phases optimally. On this subject, a large-scale observational study published in the journal Sleep (2024) confirms that sleep regularity is an indicator of general well-being and longevity that is sometimes more decisive than the simple duration spent in bed. The warning against chaotic schedules is therefore scientifically very solid. The creator makes no exaggerations and accurately summarizes the complex dynamics of our nights.

the sources

1. 1Windred DP, Burns AC, Lane JM, et al. 2023
2. 2Roenneberg T. 2023