If you really want less sleep you need to consider taking up meditation.An hour of meditation a day can reduce your sleep requirement by up to 3 hours.
I got used to less sleep by working 14 to 18 hours a day 7 days a week and then studying 3 to 4 hours yep only slept an average of 4 hours a night for 5 years. Necessity became the mother of inventions.
Unless you really have to reduce your sleep why not enjoy it... exploring the dream realm... a lot of great ideas are invented from there. 
Alex
