Insomnia is characterized only by difficulty falling asleep.
There are four symptoms usually associated with insomnia:1. Difficulty falling asleep,2.Waking up too early and not being able to get back to sleep,3.Frequent awakenings, and4.Waking up feeling unrefreshed.Insomnia can be a symptom of a sleep disorder or other medical, psychological or psychiatric problems. Often, insomnia can be treated. Symptoms should be discussed with a health care professional when those symptoms occur more than a few times a week and start to affect a person's daytime functioning.