Insomnia is a disorder that makes it hard to fall asleep or stay asleep for long periods of time. About 30 percent of adults have this sleep disorder, but many manage to function even though they build up a massive sleep debt. That can lead to health problems down the road, sap energy, and affect mood and quality of life.

Sleep is a natural part of being human. Even animals need this form of recharging, and all mammals, reptiles and birds require sleep. It is a vital part of maintaining focus, good health and vigor.

The National Institute of Neurological Disorders and Stroke reports more than 50 million Americans have a long-term sleep disorder, with 20 million more suffering from occasional problems falling and staying asleep. The Centers for Disease Control and Prevention report a sleep behavior survey in which more than 37 percent of respondents reported falling asleep during the day at least once in the previous month.

Such a lack of sleep has been linked to increased accidents on the road and in industries, more paperwork errors, and even fatalities from accidents or inattention.

Additionally, Harvard Medical School did a study that claimed one in four people suffer from some form of insomnia for three nights a week or more.