Thanks for your replies,

He is a side-side sleeper and tends to get the same symptoms no matter what side he sleeps on. We have talked about pillows, sleeping position, stress, etc. His symptoms are reducing and he had 1 pain free night about 5 days ago - however he is also mixing a few medications at the moment (Endep and diazepam) so it's hard to know how much that's contributing... I'll let you know how things develop...

Cheers,
Ray