I just went from 8 hours a night to 6.5 hours a night of 'normal' sleep. No naps. What helped is having something to do in the morning. I (want to) work for myself a few hours before I (have to) go to work. This helps getting out of bed immediately when the alarm goes of.
I'd like to try biphasic sleep. However, my understanding is/was that the nap needs to be 90 minutes because of the 90 minute cycles you're supposed to sleep in?