I found that my previous Project Sweet Tooth incentives proved to be unworkable, because if I did use them I would end up frittering away all my time reading things on the web.  So I changed the incentives back to how I had originally envisioned them:

• 1/2 hour for each day without sweets or soda
• 1/2 hour for each night of eight hours of sleep

During January, I avoided sweets for 23 of 31 days and got at least eight hours of sleep for 5 of 31 nights.  This brings me to 14 hours towards my hobbies (aka me time).  Of this time, I used about five hours, and carried over nine hours into February.