The central advice is that intense and regular physical exertion is the primary and universal lever for ensuring deep, uninterrupted sleep.

noli's read

The community is deeply divided, with strong resistance to simplistic advice that ignores individual variations. Scientifically, physical exercise is recognized by meta-analyses (e.g., Kredlow et al.) as an effective tool for improving sleep quality, as it promotes thermal regulation and homeostatic sleep pressure. However, the claim that it is a universal solution is exaggerated, as the intensity or timing (too close to bedtime) can, for some people, activate the sympathetic nervous system and delay sleep onset, as numerous comments point out. The idea of a genetic predisposition to good sleep is supported by studies on circadian rhythms and sleep structure, confirming that we are not all equal when it comes to rest. Finally, thermal practices (sauna/cold) benefit from encouraging observational evidence for recovery, but they do not constitute a panacea. In summary, the link between physical activity and sleep is solid, but its application as a sole remedy is an overgeneralization that omits individual physiological specificities.

the sources

1. 1r/sleep