Understanding the genes that make our circadian clocks tick
- Written by Giles E. Duffield, Associate Professor in Biological Sciences, University of Notre Dame

Have you ever wondered why you don’t feel tired until late at night but your spouse is fast asleep at 10 p.m. and wakes spontaneously at 6 a.m.?
We each have an internal biological clock, called a circadian clock, that organizes the internal and external activities of our body around...
Read more: Understanding the genes that make our circadian clocks tick