Just wanted to include this excerpt from The Asthon Manual regarding insomnia........

Insomnia, nightmares, sleep disturbance. The sleep engendered by benzodiazepines, though it may seem refreshing at first, is not a normal sleep. Benzodiazepines inhibit both dreaming sleep (rapid eye movement sleep, REMS) and deep sleep (slow wave sleep, SWS). The extra sleep time that benzodiazepines provide is spent mainly in light sleep, termed Stage 2 sleep. REM and SWS are the two most important stages of sleep and are essential to health. Sleep deprivation studies show that any deficit is quickly made up by a rebound to above normal levels as soon as circumstances permit.

In regular benzodiazepine users REMS and SWS tend to return to pre-drug levels (because of tolerance) but the initial deficit remains. On withdrawal, even after years of benzodiazepine use, there is a marked rebound increase in REMS which also becomes more intense. As a result, dreams become more vivid, nightmares may occur and cause frequent awakenings during the night. This is a normal reaction to benzodiazepine withdrawal and, though unpleasant, it is a sign that recovery is beginning to take place. When the deficit of REMS is made up, usually after about 4-6 weeks, the nightmares become less frequent and gradually fade away.

Return of SWS seems to take longer after withdrawal, probably because anxiety levels are high, the brain is overactive and it is hard to relax completely. Subjects may have difficulty in getting off to sleep and may experience "restless legs syndrome", sudden muscle jerks (myoclonus) just as they are dropping off or be jolted suddenly by a hallucination of a loud bang (hypnagogic hallucination) which wakes them up again. These disturbances may also last for several weeks, sometimes months.

However, all these symptoms do settle in time. The need for sleep is so powerful that normal sleep will eventually reassert itself. Meanwhile, attention to sleep hygiene measures including avoiding tea, coffee, other stimulants or alcohol near bedtime, relaxation tapes, anxiety management techniques and physical exercise may be helpful. Taking all or most of the dose of benzodiazepine at night during the reduction period may also help. Occasionally another drug might be indicated (see section on adjuvant drugs, below).