Yes, but these moments were usually followed by an all-nighter. This is my first time hearing of hypomania, but wouldn't the fatigue just be a side-effect of sleep deprivation or the followup of exhaustive mental effort?
Yes. However, one of the side effects of hypomania can be prolonged sleep deprivation/sleeplessness, which creates a pretty nasty feedback loop with days (or more!) of fatigue or outright depression at the end of it.
