Tendinitis is a condition that causes inflammation of the tendons at joint locations. When it happens at the hip, it is usually the result of repetitive movements for long periods of time. This would be the case with athletes or people who run a lot. Elderly people also get afflicted with this condition because they lose elasticity in their hip joints. Tendinitis sufferers have trouble moving comfortably and are affected by pain while at rest and sleeping.
At joint locations in the body, there are small, fluid filled sacs called bursa sacs that are used for padding. Often overuse of joints and repetitive force can cause them to inflame. This is a condition known as bursitis. The pain from bursitis gets exacerbated when you spread your legs apart or bend at the hip. Both of these situations happen during sleep. An example of bending at the hip is when you bring your knees up toward your chest to get into the fetal position.
Arthritis is a condition that causes swelling, inflammation and redness of a joint. When this strikes the hip joint, pain and limited range of motion are commonly seen. When you sleep and roll over on your arthritic hip, the pain becomes intense. If the pain is in one hip, then it is suggested to sleep on the other side. If it is both hips, you should try sleeping on your back.
When you are pregnant and sleeping, you have a couple disadvantages. One thing is that your posture is being compromised, which causes uneven weight on the hips. Secondly, the pelvis does not get an adequate amount of support from the surrounding hip joints. Both of these situations can lead to pain.