Noct, you were stuck in some magical crystal for ten years of course it's going to be kind of... scattered. Maybe it's better that way - You've also gone back and forth in time, have the magic of generations of your ancestors running through you - that's gotta fuck with you. I don't think all the rules of what's normal or not normal really apply.
But - if it worries you we can figure something out. Like set a certain amount of time you feel comfortable with being asleep for and if you go over that I'll wake you up. Or I can just try to wake you up randomly and see how easy or hard that is and figure out what your baseline is or whatever. So we know what's normal for you and maybe that'll help you feel less worried about it?