I sleep 4-6h during the week because I don't like to sleep early. (1:00-6:00 -> wake up -> work)
But I'm also one of the permanent tired people. I feel weak every day because I need 10h+ of sleep to feel good. (weekend, vacations)
I would like to get better in osu! but I can't spend that much time to play osu! at my actually state.
I'm at home at 18:00 every day and go to bed at 21:00, then I watch Videos till 23:00 or 1:00. I should sleep more but I'm addicted to Videos.
I don't like to play osu! during the week because I'm permanent tired as fuck. I also eat only shit (Chips etc.). I slowly kill myself.
I can say, that a sleepless night affect your performance.
Sorry for bad English. This text is written with my iPad at 1:07.