This is true that sleeping early and waking up early is healthier than staying up for long periods and waking up late because this relaxes the nervous system and gives it enough time to rest and sleep
Mine probably depends on how rested I was before staying awake, what I ate, or how late/early I ate. If i eat healthy and light(usually at the appropriate time), I'd stay awake till I start feeling sleepy ... On many occasions I'd be feeling very alive and awake throughout the night(usually 6pm to 4am) that sleeping would seem like waste of time.
Sleep is really important for healthy and longer life time, if you are changing the time schedule of your sleep then it could disturb your whole internal organs mechanism. Digestions usually happens while you are sleeping and also your brain is much active when you are in deep sleep so go and get good amount of sleep bro.