Insomnia is a symptom of a sleeping disorder characterized by persistent difficulty falling asleep or staying asleep despite the opportunity. It is typically followed by functional impairment while awake. Insomniacs have been known to complain about being unable to close their eyes or "rest their mind" for more than a few minutes at a time. Both organic and non-organic insomnia constitute a sleep disorder.
Transient insomnia lasts from days to weeks. It can be caused by another disorder, by changes in the sleep environment, by the timing of sleep, severe depression, or by stress. Its consequences - sleepiness and impaired psychomotor performance - are similar to those of sleep deprivation.
Acute insomnia is the inability to consistently sleep well for a period of between three weeks to six months.
Chronic insomnia lasts for years at a time. It can be caused by another disorder, or it can be a primary disorder. Its effects can vary according to its causes. They might include sleepiness, muscular fatigue, hallucinations, and/or mental fatigue; but people with chronic insomnia often show increased alertness. Some people that live with this disorder see things as though they were happening in slow motion, whereas moving objects seem to blend together.Can cause double vision
The pattern of insomnia often is related to the etiology.
Onset insomnia - difficulty falling asleep at the beginning of the night, often associated with anxiety disorders.
Middle-of-the-Night Insomnia - Insomnia characterized by difficulty returning to sleep after awakening in the middle of the night or waking too early in the morning. Also referred to as nocturnal awakenings. Encompasses middle and terminal insomnia.
Middle insomnia - waking during the middle of the night, difficulty maintaining sleep. Often associated with pain disorders or medical illness.
Terminal (or late) insomnia - early morning waking. Characteristic of clinical depression
Psychoactive drugs or stimulants, including certain medications, herbs, caffeine, cocaine, ephedrine, amphetamines, methylphenidate, MDMA, methamphetamine and modafinil
Hormone shifts such as those that precede menstruation and those during menopause
Life problems like fear, stress, anxiety, emotional or mental tension, work problems, financial stress, unsatisfactory sex life
Mental disorders such as bipolar disorder, clinical depression, general anxiety disorder, post traumatic stress disorder, schizophrenia, or obsessive compulsive disorder.
Disturbances of the circadian rhythm, such as shift work and jet lag, can cause an inability to sleep at some times of the day and excessive sleepiness at other times of the day. Jet lag is seen in people who travel through multiple time zones, as the time relative to the rising and setting of the sun no longer coincides with the body's internal concept of it. The insomnia experienced by shift workers is also a circadian rhythm sleep disorder.
__________________________CSS
link text italics bold underline strike
