Stretch every extremity for 15 seconds. Try this before you open your eyes. Lift your arm and begin by stretching each finger, then your hand, then your wrist, then your arm. Repeat with the other arm. Then your toes, feet, ankles and legs. End with a neck and back stretch that propels you out of bed. You've just limbered up your muscles and joints, and enhanced the flow of blood through your body, providing an extra shot of oxygen to all your tissues.