Its the only superpower I actually want - to be able to just turn myself off like lightswitch. My brain itself is fairly happy just sort of thinking about compilers or field theory and stuff like that when going to sleep but I physically cannot stop myself from putting my fingers in yet another pie when I'm awake so I end up in this hyperfocused state in bursts of an hour or two and then I won't be going to bed possibly ever.
Sometimes I'm completely fine, sometimes the only way I'm getting up before 12AM is if I haven't slept a second. Even more annoying is that I have no vices other than tea - ADHD has been bandied around at me in the past, could be something like that.