I have a theory that by oversleeping too much your body goes into sort of hibernation mode and wants to preserve energy to the end of the world. On the other by

I have a theory that by oversleeping too much your body goes into sort of hibernation mode and wants to preserve energy to the end of the world. On the other by sleeping little and having strict schedule you enter a type of primal survival mode, similar to if you were sleeping outside on savannah, which keeps you alert even with minimum sleep. I had and have the problem that if I don't put alarm on, I will oversleep and my day gets kind of ruined. So for me I always have to set an alarm and if I feel tired and have nothing on morning I'll maybe bump it by an hour. For me the best sleep schedule is going to bed by 12-2 and waking up between 8:00-9:30. This way if I occasionally stay up till 3-5 my sleep rhythm won't be completely ruined. I have experimented with various different tricks and styles, recently after a long vacation in different timezone allowed me to completely transform my sleep rhythm. After I came back I woke up automatically 6:00 sharp without any alarm, and I went to sleep 22-23 which was quite bizarre. Sadly though I enjoy late evenings much more than early mornings so even if I went to sleep 0:30 I'd wake up at 6, very tired, which led me to sleep longer and in the end ruining the rhythm. But what I've found out is, that you want to wake up exactly during the light sleep cycle as that's when you feel no tiredness at all waking up. If you try waking up during REM or deep sleep it will feel like pulling teeth. For me the best time is somewhere around 8 if I go to sleep by 1-2 which counts up as ~7 hours. Should probably track it better but yeah. Also I bought wake-up light alarm clock which is interesting but I don't know yet has it actually an effect. Although I have to say following an exact schedule is probably the best solution sleep-wise. Decide a time when you have to be at bed and an exact time when you have to wake up, no matter what. I think doing this during my vacation is what caused it to be so ingrained in my body that I was able to wake up at 6 without any alarm.