Whilst it is often comfortable to slumber in what is named the fetal position, with legs curled up, this can make for an uneven distribution of fat and bring on back pain and sore joints. It might also cause hip pain (hip bursitis) and shoulder pain, which includes shoulder bursitis. https://comfortable-sleeping-posi64184.topbloghub.com/40568043/a-review-of-comfortable-sleeping-positions-for-neck-pain