hai...

There are more than 70 different sleep disorders. Four of the most
common disorders are described below.

Insomnia, the most common sleep disorder, is defined as difficulty
falling and staying asleep every night or most nights, despite an
adequate opportunity to sleep. Other symptoms of insomnia include
waking up too early in the morning and being unable to fall back to
sleep, and experiencing an unrefreshing night's sleep. As a result of
a poor night's sleep, one usually feels tired and irritable the next
day and has trouble concentrating on everyday tasks. Insomnia also can
be a symptom of other physical and mental conditions, such as
depression, or even of another sleep disorder, such sleep apnea.

Insomnia can last one night or up to several weeks. In some patients,
it can be a chronic condition and last for years. Transient insomnia
lasts for short periods of time and is described as "intermittent"
when it occasionally re-occurs. Chronic insomnia is when episodes
occur on most nights and last one month or more. According to the
National Sleep Foundation's 2002 Sleep in America poll, 58 percent of
adults surveyed reported experiencing one or more symptoms of insomnia
at least a few nights a week in the past year, a number that
represented 63 percent of adult women and 54 percent of adult men.
More than three in ten (35 percent) say they have experienced insomnia
every night or almost every night

On Mar 16, 4:58 pm, "roja" <roja_om...@yahoo.com.my> wrote:

Dear
I ran into your message quite accidentally while researching about
some details on 'Sleep Disorder' and thought of sharing some of my
findings.
I've read at 'http://www.medical-health-care-information.com/Health-
living/sleep/index.asp'
that sleep disorders are caused by some sort of internal disturbance
in the sleep-wake cycle. They are categorized as dyssomnias or
parasomnias. Dyssomnias involve abnormalities in the amount, quality,
or timing of sleep. Common dyssomnias include:
1) circadian rhythm sleep disorder, which involves a resetting of the
body's sleep clock
2) hypersomnia, which is sleeping too much and sleeping at the wrong
times
3) narcolepsy, which involves a sudden, overwhelming need to sleep at
all times of the day
4) primary insomnia, which is trouble falling or staying asleep
5) sleep apnea, a condition in which breathing stops during sleep

I hope the above is of some help to you as well. Regards, Sherrybove