Time for bed! You need your sleep. Training for a marathon, weightlifting in the gym, and even routine workouts can be demanding on the body. Your muscles need some shut-eye to repair. So be sure to get at least seven to eight hours of sleep on a regular basis. It can be difficult at first, especially if you're a natural night owl. You’ll make it through training/workouts injury-free and improve your progress. Get into the habit now, and ensure that your routines are as reliable as the alarm clock that goes off each morning.