After a poor night's sleep, it is recommended to engage in moderate-intensity physical exercise to restore intellectual faculties and alertness, while avoiding overly intense training to prevent injuries and preserve natural defenses.

noli's read

The idea of using physical activity to counter mental fatigue is scientifically compelling. A systematic review published in *Medicine & Science in Sports & Exercise* confirms that a moderate exercise session helps restore alertness and cognitive performance following sleep restriction. The recommended caution regarding intensity is also justified: an observational study led by Milewski and his team shows that a lack of repeated sleep doubles the risk of injury among athletes. Regarding the impact of inactivity, an experimental study published in *Frontiers in Aging Neuroscience* corroborates that a 10-day break from training reduces blood flow in key areas of the brain linked to memory. However, the direct link between high-intensity morning exercise and a specific increase in REM sleep is slightly exaggerated. Although regular exercise generally structures our nights better overall, research indicates that the impact on specific sleep stages depends heavily on individual profiles.

the sources

No named source held this one up — that absence is part of the verdict.