No, because you still age during sleep. The whole point of time travel (even though it's mathematically impossible) would be to skip backwards or forwards through huge lengths of time while retaining your current physical and mental state. If you sleep for 6 hours, you have aged just that little bit. Also, say if you're drunk when you go to sleep, when you wake up your sober, because time has still been moving around long enough for your blood-alcohol level to return to normal, it hasn't stopped or advanced any quicker than usual, you just haven't been aware of it. Time travel is cheating the rules of time, sleeping is basically just loosing consciousness for a while.
If this was highschool, I'd be getting a horrible beating right now.