Insomnia is difficulty getting enough sleep or trouble sleeping without interruption. You may have difficulty falling asleep, may wake up too early, or may wake up periodically during the night. Insomnia of any kind can keep you from feeling rested and refreshed during the day.
Almost all of us have episodes of insomnia at some time, but insomnia is not a short-term problem for everyone. Insomnia is classified as chronic when it happens almost every night for at least one month. Insomnia can be related to a medical or psychiatric illness, can be caused by mental stress or excitement, or can be caused by your daytime and bedtime habits.