This one factor may explain why you're a morning person or a night owl
Business Insider,
Feb. 2, 2016, 11:17 AM 15,194 Are you a morning person or a night owl? The answer may be written in your DNA.
Feb. 2, 2016, 11:17 AM 15,194 Are you a morning person or a night owl? The answer may be written in your DNA.
(Shutterstock/Voyagerix) Are you a morning person or a night owl? The answer may be written in your DNA.
Are you a morning person or a night owl? The answer may be written in your DNA.