I keep sleeping on my arm and it hurts!

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Just before Christmas I becasme aware of a stiff right elbow. Not agony, but definitely stiff.

It's still stiff, but recently I have realised that every morning whem I wake up, I'm laying on it. It's not underneath me when I go to sleep, but it always is by morning. How can I train myself not to sleep on my arm?

Can you have an extra pillow on that side, with your arm on the pillow?

clothes pegs down attached to your sleeve on that side ,all down your arm