Why it's OK to sleep in on weekends: Dr. Natalie Azar explains

/ Source: TODAY

NBC News medical contributor Dr. Natalie Azar visits TODAY to discuss the latest medical headlines, including new guidelines that lower the age for many people’s first colon cancer screening from 50 to 45, and a new treatment for migraine sufferers. She also explains why new thinking says you CAN catch up on your sleep on weekends after all.