There are a variety of sleep disorders that are classified as a form of insomnia. This type of sleep disorder involves the inability to fall asleep or stay asleep.
The most common sleep complaint occurs when you have trouble falling asleep, staying asleep or do not feel refreshed in the morning. Daytime fatigue and other effects of insomnia can impact nearly every aspect of your life.
A small percentage of adults are short sleepers. They feel alert and refreshed after sleeping less than 6 hours per night. Short sleepers function well during the day and do not need to try to "catch up" on sleep.
Many children have trouble falling asleep or staying asleep throughout the night. Other children do not get the sleep that they need because they refuse to go to bed, stall or make it difficult for parents to leave the bedside.