"Chronotypes are the classification of the natural timing of your circadian rhythms," Murray begins. "Your circadian rhythm is your body's clock that dictates the time in which you're sleepy, alert, and hungry. It controls the timing of digestion, your body temperature, and even wound healing," among many other bodily processes and functions.
While it's fun to figure out which one you are, Murray says that chronotypes are actually backed by science. "Research shows that chronotypes are inherited from family members, which indicates that genetics play a role," Murray explains.