When I'm hypo I sleep about 5-6 hours. I get absolutely absorbed in projects - for two weeks I had transformed my balcony (in an apt building) into a wood shop. I was buying tons of furniture off craigslist, dismantling it, and re-doing it. I bought a professional belt sander which I later returned. For 10 hours a day I sanded, painted, nailed, sanded, stained, and on and on. No break. Only water. And then one day.... I was done. Mid project too (which annoyed boyfriend to no end). I couldn't even muster the will to sweep up the sawdust.

Anyway, dunno if that helps. But that's pretty typical for what I go through, as someone who only gets hypo.