It is human nature to feel comforted and protected when sleeping in a fetal position—after all, we were in that position for nine months once upon a time.
Personally, I love sleeping on my side—with half my face is resting against the pillow most of the night. As comfortable as that position is, I am fully aware that pressing my face against the pillow night after night can be detrimental to my skin: formation of fine lines, crow’s feet and wrinkles. Yikes!
With that said, the best way to sleep is to lie on your back with your head slightly elevated with two pillows. Granted, it’s not easy to maintain this position throughout the entire night—especially if you are one to toss and turn a lot, but aim to sleep on your back as much as possible in order to help prevent premature signs of aging.