it seems to me that some people seem to equate fewer hours sleeping to somehow being smarter or busier or just better (?) - I have never understood this, for I need sleep! When I run a lot and bike a lot I sleep more. This is how my body recharges and how I manage not to hurt myself. When I lose my precious sleep, I tend to get sick. Though having said that, six days a week of high intensity work outs is just begging to get hurt or sick! Your body needs time to recover. Even when I'm doing crazy miles running, my daily runs are kept pretty short (4-6 miles), and of fairly low intensity. Same goes for riding for me - If I'm going to do a century on the weekend in the hills, I keep my daily rides/runs pretty easy. Listen to your body and rest as needed - take two pieces of chocolate and let us know how you feel in the morning