Courtesy of StackCommerce Britannica Shop provides useful guides to everyday living. This content is created by independent writers who have no influence on Britannica's editorial policies and standards. Britannica's editorial staff is not involved in the creation of this content. When you make a purchase using these links, Britannica may receive revenue. The average person needs at least 7 hours of sleep a night to function at optimal levels, and it’s an unfortunate fact that 35% of American adults are not getting the recommended amount. As a result, not only do they suffer consequences the next day in the form of drowsiness, irritability, and inattentiveness, but they may also experience longer-term health issues—both mental and physical—if the pattern continues. If you are one of the less fortunate who find yourself tossing and turning night after night, counting sheep, drinking warm milk, or reading 'til the wee hours, there is a better alternative for getting the rest you need.