Noted: Although there?s no standard definition for insomnia, suggested criteria include taking more than 30 minutes to fall asleep, waking up too early, or sleeping less than 6.5 hours a night, write Morin and co-author Ruth Benca, MD, PhD, a sleep disorders doctor at the University of Wisconsin, Madison. If you meet any of those criteria and feel like you can?t focus during the day because you?re so tired, you might have insomnia, they say. But if you feel fine after sleeping less than 6.5 hours at night, you might just be a short sleeper.
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