One of the things I hear writers complain frequently about is lack of sleep. When your family has functions going on (BTW, Happy belated Father's Day to all you dads out there), your house needs cleaning, and your writing bug bites at one A.M., when are you expected to get that nap in? And of course, when you do sleep, you can always look forward to the cat pouncing on your head in the wee hours.
Sadly, writing is the item that usually gets back-burnered in favor of the other ones (though really, your family should come first, shouldn't they? Ahem.). But there is a solution. You can train your muse to come calling at reasonable hours.
If you sit at your computer at the same time every day - and write, even if it stinks - eventually your muse is going to get the hint that she'd better be around at that time of day. And your writing will get better. And you might actually get some shuteye when you should.
Trust me. The dust bunnies will be there when you finish.