The busier my life gets, the more I realize how necessary it is to step back and take mental breaks. When you're rushing around at work, doing several experiments at once, only to come home to dinner and chores, it's very draining. That's bad for anyone, but when you're also trying to write, you're left with no energy and a blank screen. Mental breaks give you a chance to think about your story before sitting down at the keyboard; that way, you're ready to write right away.
I unwind in several different ways. The Internet is always a good standby with forums and e-mail to read, plus there's games. Of course, these mental breaks can last all evening if you don't discipline yourself. Eugene and I have taken lately to playing Yatzee! after dinner; it gives us some couple time. TV is another way to relax, though I try not to watch too much of it. I also like to read and crochet, but it's harder to find time to work on those projects for an extended chunk of time.
Of course, life is going to become even more hectic soon once our baby arrives. But I think even then I'll need to find the time to relax. It's not something you can regulate just to the weekends or vacations; you need some chill time every day to keep your sanity.
On that note, I think I'll call it a night.