I would say sleep is very important. It's not a waste of time because you are in the spiritual dimension when asleep. The mind is sorting, working and allowing the body to repair and recharge. Less mind clutter allows for much more deep mind association and interconnection with the other than conscious life, to borrow an idea from Paul. That's my take. Although you may know that information and you are saying less sleep is for you; How much is needed I'm not sure, but maybe someone else knows what most people need approximatly. Enjoy your progress. Hike