There are three main types of insomnia including:

1. Sleep Onset Insomnia (difficulty falling asleep)
2. Sleep Maintenance Insomnia (difficulty staying asleep), and/or
3. Early Morning Awakening Insomnia (waking early with difficulty returning to sleep)

For a diagnosis of insomnia to be appropriate, individuals must also report distress about sleep or difficulties functioning (at work, school, or socially) because of sleep problems.