On work days, if the deliverable is not that important, I procrastinate and do other things I want. I do not care even if my boss yells at me; if I feel my work goes blah, or meh, that means I'm getting too stressed out or things are just going -- meh. It's better than fully losing interest to my work.
(Warning: Procrastination is addictive. Do it in moderation.)
On non-work days... I meditate, go to Churches, go window shopping, etc. Most of these non-work days I sleep longer than usual to make it up for the lack of sleep I had during the work days.
(Warning: Sleeping more than 9 hours can cause headaches, body pains and other health problems.)