Clinical Disorders Of Insomnia
Psychiatric disorders often cause persistent insomnia. Depression is often accompanied by fragmented sleep or early morning awakening, decreased time and altered distribution of NREM sleep, the earlier onset of REM sleep and a change of MOR activity in the first half of the night. In atypical cases, depression may be associated with hypersomnia. In manic disorders, insomnia is a cardinal feature and an important early sign of impending mania in bipolar cases.
Drug abuse is often accompanied by insomnia; alcohol can cause or be secondary to the sleep disorder. There are tendencies to use alcohol as a means of considering sleep without altering the normal sleep cycle. Chronic alcohol abuse increases and decreases one stage REM sleep, the symptoms persist for many months after the individual has stopped drinking. The acute alcohol withdrawal causes delay to the onset of sleep and REM rebound with intermittent waking during the night.
The heavy smoking (more than one pack per day) causes difficulty falling asleep, apparently independently of the increase-often-competing coffee consumption. Excessive intake of caffeine and other stimulants such as folk remedies for colds almost bedtime reduces the total time of REM sleep mainly, with some increase in the intensity of sleep.
Sedative-hypnotics, benzodiazepines specifically who are the drugs of choice for promoting sleep, tend to increase total sleep time, decrease their latency and reduce nocturnal awakening with variable effects on NREM sleep. Its deletion causes the opposite effects and contributes to the problem with prolonged use of sedatives. After a time (usually 30 to 60 days of using it every night), the continued use of the drug is to prevent withdrawal symptoms. Several psychotherapeutic drugs (e.g. trazodoma, thioridazine) have sedative side effects and can be chosen for disorders which are indicated by this property, some popular preparations (e.g., antihistamines, stimulants) are sold side-effects of altered sleep. Antidepressants decrease REM sleep to suppress them with remarkable rebound in the form of nightmares and have variable effects on NREM. The former is correlated with reports indicating that the suppression of REM sleep parallels the improvement in some depressions.
The persistent insomnia is also associated with a variety of medical conditions including pain and respiratory distress syndrome. Adequate analgesia and appropriate treatment of medical problems require to the symptoms and reduce the need for sedation.
Other disorders that are associated with insomnia include nocturnal cyclones, which involve repeated leg movements during sleep (every 20 to 40 seconds) and anterior tibia muscle contraction. There may be waking up intermittently, but the client usually does not notice the problem. There may be sleepy during the day.