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Article:

How Your Bedtime Is Affecting Your Job Performance

Tips for Coping with Work When You Have a Sleep Disorder

Signs You Suffer from Delayed Sleep Phase Syndrome

Are you wondering whether you or someone you know has delayed sleep?

Mansbach explains the primary indication is not being able to fall asleep at the appropriate time, night after night, even when sleep deprived—but falling asleep easily and sleeping well later in the night. "Anyone can have difficulty getting up in the morning after staying up late the night before. But most people in this situation can then fall asleep on time the following night. People with delayed sleep phase syndrome generally cannot."

So people with delayed sleep would normalize their sleep habits if they could—but they really just can’t.