I went all of the way through school getting about 4-5 hours of sleep a night or less (about 3 hours if an exam was the next day). I also trained about six days a week as a "release" for studying. I made very good gains in that time period. I personally believe that where one factor of your training success is lacking, another can be amplified to take its place. My workouts were short (around 35min) and intense. My food intake during that time was in no way restrictive aside from brief periods of attempting to lean up a little. I am sure if my food intake had been overly restrictive, my recovery would have been compromised.
I currently get more sleep than I have ever gotten in the last 10 years or so. I don't expect that to be the norm because I have never been one that felt the need for more sleep. I am hyperactive in terms of things running through my head constantly which often makes even getting to sleep initially a problem.