I have been getting less sleep lately, but I don't really have a problem with that. When I was drinking, I would usually stay up really late getting tanked one night (like 2,3,4AM), have to go to work the next day, feel terrible, then come home that afternoon and be useless and go to bed early. Next day I would feel rested, get drunk, my 2-day cycle started again.
Since I quit drinking, I have found I can stay up until 1-2AM, and get up at 7AM feeling good, etc. I know this is not technically enough sleep, but I do feel so much better and am getting so much done.