To pile on the anecdata: an all-nighter in my 20s was something feasible, even going through the next day (as in, day+night+day feeling fully awake, then resume

To pile on the anecdata: an all-nighter in my 20s was something feasible, even going through the next day (as in, day+night+day feeling fully awake, then resume usual behavior with normal night's sleep, and no further effects); at 25, this became harder, with a crash in the afternoon, at 30, an all-nighter meant sleeping through the next day, and currently just not getting at least 6 hrs of sleep will crash me the next afternoon. sigh