Positives:

Prevents neck and back pain.
Reduces acid reflux and snoring.
Relieves heartburn.
It removes waste from the brain efficiently, reducing the risk of disorders.
It is associated with fewer nighttime awakenings.
cons:

It may restrict blood flow, causing shoulder and arm pain.
Nerve compression may stress internal organs.
Possibility of sagging breasts and premature skin aging.
Solution:

Use a satin pillowcase to reduce facial wrinkles.
Place a pillow between the knees to support the upper leg.

5. Fetal position
   Sleeping with the knees toward the chest and the chin down is what characterizes the fetal position, and is widely common among women.