Do you wake in the morning with a stiff neck/Jaw/Shoulder and then the tension recedes during the day?The chances are your sleep position or mattress and pillow need changing.
I have tried many pillows over the years and spent a lot of money in doing so as you can only buy a new pillow and sleep on it for a while before knowing whether its going to help. This M LINE athletic pillow is by far the best I’ve ever used and I highly recommend it, worth every penny.
You can pick one up from Back2 in Wigmore St.
If your budget is tight then take a look at the John Lewis Memory Foam Contour.