A friend of mine, Omni5cience, made a nighttime- and mobile-friendly fork of Sleepyti.me:

http://omni5cience.github.com/sleepyti.me/

I made a buttonless varient of it that works like a clock (the wakeup times stay current):

http://sidnicious.github.com/sleepyti.me/

We both love Sleepyti.me and it’s awesome to hear that you’re making some money off of it. (If you’re uncomfortable with us keeping the same name drop one of us an email.)