I dont know if this is realted to me rowing, or just overall bad luck, but every now and then I get issues with one of my shoulders. Normally it passes if I just take it easy for a a week or two. I'm currently having some pains in my left shoulder, and I'm thinking it's from rowing, or the fact that I normally sleep on the side with my hand tucked under my head. Last week the pain was so bad I would wake up during the night and have issues falling to sleep again. It's much better now, but it's still sore. I dont feel any pain from rowing, but it seems the night after a rowsessions it gets worse.
Can someone please help point me in the direction of some good exerscises or streachings that could help sort out bad shoulders? If it matters, the pain is usually from the very top of the should?

Please help

I didn't find the right solution from the internet.

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Thank you