Of course, the medical profession about the many causes of insomnia.
当然，医学界关于失眠症的病因还有很多。
There are many causes of insomnia, and exercise may be contributing to the problem.
失眠有很多原因，锻炼可能只是众多原因中的一种。
This is a very good question, and as there are a number of causes of insomnia, I can't give a definite answer.
这个问题提得很好，失眠的原因有很多，我不知道确定的答案。
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