Why do i have hip pain after sitting a while then standing? also when laying down sleeping?

Let me explain: Pain and stiffness of the joints can also occur after long periods of inactivity (for example, sitting in a theater). This one the major sign of what we call degenerative arthritis.

See Orthopaedic Surgeon: There is a long list of things that could be causing your hip pain, including referred symptoms from other locations. If your pain is significant and persistent then i would seek consultation from a local orthopaedic surgeon.