There are over 100 sleep disorders that have been identified and insomnia is definitely one of the most common problems.
Episodes of insomnia can be short- or long-term (chronic) and involve difficulty falling asleep or staying asleep as well as awakening very early. Some reasons for suffering with insomnia include: anxiety, stress, depression, caffeine, alcohol, drugs and medications, illness, napping during the day, and surrounding influences (too much noise or light).
Some disorders of insomnia are: