Make sure you don’t have sleep apnea, 

a very common and dangerous medical condition that can cause excessive sleepiness during the day. If you snore loudly or are overweight, you are at risk. Sleep apnea causes complete interruptions in breathing while asleep and results in serious damage to the heart, brain, and other organs. A convenient “home sleep test” in your own bed can determine whether or not you have sleep apnea and how severe it is. More information at www.bluesleep.com