[maroun]

Power naps can be very effective when used right (i.e if you're consistent with them). In the last month of my semesters I switch my sleep over to Polyphastic sleep schedule. 6 Hours of sleep at night and one 20minute nap in the afternoon. It gives me more time to study for finals/finish up class projects.

Check out this post for more information: http://dustincurtis.com/sleep.html

[Dewie]

Do you mean polyphasic sleep? If you sleep two times in a 24 hour cycle, that's biphasic sleep.