Free/AFK time is important - having hobbies/things to do out of the house are essential.
Taking a long 3-day weekend away from home (for those who work out of the house) can do AMAZING things for you - psychologically, spiritually, emotionally and in BUSINESS believe it or not. We all need a little reboot every now and again.
And... just in case you were wondering... webmaster conferences do NOT count!
|shocking|
Find something you enjoy doing - whether its reading, playing an instrument, going to concerts, hanging out with friends/family, playing a sport or whatever and DO IT. Make time each day to switch gears and give the other parts of your brain a chance to exercize.