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Article:

How Your Bedtime Is Affecting Your Job Performance

Tips for Coping with Work When You Have a Sleep Disorder

Not Everyone Chooses to Stay Up Late

"Most night owls are able to adjust their schedules to sleep earlier when required, so they can get up when needed," says Mansbach. So folks with delayed sleep are night owls who can’t override their body clocks.

"People with delayed sleep phase syndrome are actually unable to fall asleep earlier, and therefore must extend sleep later in the day or become sleep deprived," adds Mansbach.

So it sounds like people with delayed sleep are night owls not out of choice, but because they have special biological needs.