The human body is not a PC that you set to do a certain action at a certain time. It doesn’t work that way. Sleeping 8-9 hours a night is not always advisable. When you are rested, you do nothing during the day, you don’t get tired, you sleep another 8-9 hours, you simply vegetate. And your attention span and abstract information retention power decreases with a lot of sleep.
The brain also needs activity to function in optimal parameters, to be Ok. In the absence of activity, it atrophies. It’s the same as obesity, you don’t exercise, you eat a lot, you gain weight. Likewise, the brain, this huge organ, which consumes the most energy, I think more than the stomach to digest, must be kept active. Otherwise, at some point, we go crazy.
It’s OK to sleep well at night, it’s OK to sleep 8-9 hours, but if you feel that it’s hard for you to perform abstract mental tasks or not, like calculations, writing, if you have problems with creativity, it might be that you’re not training your brain enough. And this comes from languor. From lack of intellectual or mental activity.
It’s really good to lose a night sometimes, or a few hours of the night. Sometimes it is even advisable to sleep only 3-4 hours, once or twice a week. Don’t sleep more than you have to! He plays board games, such as chess, scrabble, GO, bridge and reads books or whatever he catches. This will help you.