Derby can sleep until about 8 (when we go to bed around 11), and as long as he goes for a pee he'll go right back to bed. I might also add that after he's been out for pee, he wants to cuddle so putting him back in his bed/crate overnight is not an option. We spoil him now and then by leaving him out of it all night sometimes, but that's general consensus.
I'm a migraine sufferer myself, and on those nights- i don't even bother putting him in his cage. that way he'll sleep whenever I tell him it's time for a nap.
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