Sleep
Insomnia is a general term for difficulty falling asleep and/or staying asleep. Insomnia is the most common sleep problem, with many adults reporting occasional insomnia, and 10–15% reporting a chronic condition. Insomnia can have many different causes, including psychological stress, a poor sleep environment, an inconsistent sleep schedule, or excessive mental or physical stimulation in the hours before bedtime. Insomnia is often treated through behavioral changes like keeping a regular sleep schedule, avoiding stimulating or stressful activities before bedtime, and cutting down on stimulants such as caffeine. The sleep environment may be improved by installing heavy drapes to shut out all sunlight, and keeping computers, televisions and work materials out of the sleeping area.
Clinical neurochemistry
Dyssomnia is a class of sleep disorders which includes Primary insomnia, primary hypersomnia, narcolepsy, breathing-related sleep disorders, circadian rhythm sleep discorer, and other conditions. Primary insomnia is a disorder in which a patient has difficulty initiating and maintaining sleep. Behavior modification and a reduction in neurologically active substances such as caffeine and alcohol seem to be among the most promising treatments. Although the mechanism is unknown, brain plasticity and behavior modification are utilized to train patients to only go to bed when tired, associating the bed itself with a sleepy state.