While falling back doesn’t have the severe consequences as when we start daylight saving time, there is still an impact on your circadian rhythms, the 24-hour cycles that are part of the body’s internal clock.
It’s not just your sleep schedule that runs on a circadian rhythm. Many of your internal organs have their own clock that turns off and on with your circadian rhythm. Changing that schedule not only impacts your sleep, but also things such as when it’s best to eat your meals for proper digestion, your mood, how you learn and work, and when to best exercise.