can be misdiagnosed as insomnia, as sleep onset is delayed much later than normal, while awakening spills over into daylight hours.

It is common for people who have difficulty falling asleep to also have nocturnal awakenings with difficulty returning to sleep. Two-thirds of these people wake up in the middle of the night, with more than half having trouble falling back to sleep after a middle-of-the-night awakening.

Early morning awakening occurs earlier (more than 30 minutes)

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