For some of us ,there is an obvious alternation. People that know me have commented on it seeming like I have two different personalities or something. (I do NOT mean in the DID sense. There are no completely separate named alters nor are there amnesia gaps .) What they and I am referring to is that I will be very bookish and nerdy (mostly quiet but can become talkative about a subject of interest, very laid back ,enjoy reading, researching, and drinking tea)and am somewhat sensory avoidant.Then I will suddenly change (loud rapid speech, random laughter about almost everything, enjoying things like climbing trees, singing opera, galloping back and forth, want to go places and do things like learning to fly a plane ,carnival rides,various horse back sports,ect. though most of it never happens due to finances and lack of my own transportation so I just gallop, hop,spin,ect. while daydreaming about all the exciting things I plan to get out and do just as soon as I can. When I can calm down enough, I chatter in a rapid speech manner at whoever will listen about all my big plans. Then later I change back into my usual shy, quiet, nerdy self. I learn a lot when I am in nerdy mode. I can't focus enough to learn much of anything when I am in hyper mode,but I would miss that mode nevertheless if I quit having them because I am so happy and enthusiastic in those times, not that I am unhappy the rest of the time (I really enjoy my research and the like when I am in my quieter mode) just that in hyper mode I am SUPER happy.