I would definitely sleep if you're able. Sleep is a lost cause this far into pregnancy so if your body allows you to sleep or rest comfortably then do it.
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SLEEP!!! I am on baby #3 and I have learned sleep is priceless. The cleaning will get done eventually. If your body needs to rest, listen to it. Keeping you and baby healthy is the most important thing right now.
This happened to me too, but only recently. I got all excited and cleaned everything when it got close to baby's due date, but now that it's passed I'm just exhausted and steam-less.
Re: nesting energy gone
I'm right there with you! You just need to listen to your body. If you don't feel like cleaning, then don't!