Know the feeling. I'm doing constant projects that have little purpose except for I'm learning how to make charts from stats in Excel that are pretty.
I woke up at 3:50 this morning and am still going strong after work and therapy. My body is totally suffering on these 4-5 hour nights, but I'm afraid of depression if I sleep too much so I don't take all my sleep aid. I feel bad that I'm too scared, but I do take part of the dose.
My hypomania has definitely taken over. The projects are a compulsion. If I didn't have them, I guess I might go mad with posting on here (more than usual I mean) and I've already sent a ton of emails to the same people just to add another PS over and over! I think I can do anything, and I do it, but I usually stop in the middle of one and start another and another until I have 4 things going at once. I love it, but in another way I hate the idea of exhaustion and a crash and that I'm not writing creatively.
I relate.

Glad you're resisting so far, but it's not bad to do things that you can accomplish. Why not use up some of the excess energy? Instead of thinking of every task as an "all or nothing" kind of project, why not decide, I'll do just the hedges or just the flower bed and tick it off and have another box for another task you can do the next day. Sorry if I'm being redundant. My short term memory is shot and this sounds familiar even to me.
Hoping you'll find that perfect balance...and I'll try too.