I like to reward myself here and there. And I like to put myself on a schedule. These two things work really well together, like when I set the timer on the microwave and give myself 10 minutes to clean the kitchen floor, and after I run to turn it off before it beeps I allow myself 10 minutes on my reader catching up on blogs, news, etc.
Lots of things stand in for chocolate milk. Time with my husband, playing with the kids, reading, blogging.
What can I say? I work well on a deadline, especially when I get to treat myself afterwards.