Why do our heads fall forward when trying to sleep upright in a chair for example

Question

Why do our heads fall forward when trying to sleep upright in a chair for example

In: Biology

Answer 1

Your head’s center of gravity is slightly in front of where it connects to your spine. When you fall asleep your muscles relax and the muscles that hold your head upright are predominantly in the back of your neck pulling the back of your head downward (and thus your face upward). When your muscles relax, your head will follow its center of gravity, whether that’s rolling to the side or falling forward/backward depending on your position.