A truly restful night's sleep rejuvenates your entire body and provides a multitude of benefits. Proper sleep is absolutely essential to maintaining good health and well-being. A good night's sleep lets your body relax and heal from the day's stresses and activities. It also re-energizes your body and mind, and helps you prepare for the day ahead. Poor sleep, caused by an uncomfortable mattress, can lead to a wide variety of negative side-effects and health conditions.