回答
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When I turn over in my sleep, I hurt my shoulder and wake up.
When I turn over in my sleep, I hurt my shoulder and wake up.
寝てる間に体の向きを変えると肩が痛くて目が覚める。
turn over = ひっくり返す
in my sleep = 寝ている最中に
hurt... = ...を痛める
回答
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I wake up because my shoulder hurts when I roll over.
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I can't sleep because I get a pain in my shoulder when I roll over.
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When I roll over I get a shoulder pain and it wakes me up.
「肩が痛い（痛くなる）」は
my shoulder hurts
I have a shoulder pain
I get a pain in my shoulder
a pain occurs in my shoulder
などと表現できます。
日本 
