Rest is not the same as sleep. Real rest takes place when you are not consumed by the exertions of work or the physical toll of training. Sometimes rest is hard to come by, but it’s necessary to reach your full potential.
A few years ago, I started taking Sundays off from training. It has been the best thing for my body and probably more importantly, my mind. When the end of the week approaches and I am worn out from training, I focus on Sunday. My body certainly needs the break, but my mind appreciates it even more.