
15. Muscle Atrophy
After you lift weights at the gym, your muscles need to recover in order to grow bigger and stronger. If you get less sleep, your hormones will begin to get off-kilter. Your cortisol will increase, while testosterone will decrease. Just like healing from an injury, your body needs a lot of sleep to make your muscles grow. If you are attempting to be a body builder, get a six-pack, or just generally get more toned, make sure you are getting a good night’s sleep.