Answer: For many people, insomnia happens occasionally in response to life events. These events, exciting or stressful, can keep you awake and thinking late into the night. Other people develop poor sleep schedules, sleeping late into the morning or napping during the day. This makes sleep at night more difficult.Insomnia may be a symptom of depression. If you are feeling down, are fatigued, and are having trouble falling asleep or are waking up early, you may be depressed. There are helpful treatments for depression that may cure your insomnia if the two problems are related.Insomnia may also be a symptom of a sleep disorder or medical problem. Finding the cause of your insomnia can help your doctor determine what treatment you need.