Mrs. Smith最近遇到了一个问题，她给某医学杂志的专栏作者Jenny写了一封信，以寻求帮助。

Dear Jenny,

   I was very healthy before, but these days I can’t sleep well. I always

can’t stop thinking about the things in the daytime. I don’t know what I

should do.

   Can you help me?

   Thanks a lot!

                                                 Yours,

                                                 Mrs. Smith

  根据所给内容及下列提示内容，帮 Jenny给Mrs. Smith回一封信。80词左右。

提示：1.尽量放松，不要想太多。  2. 睡前多做些运动。

      3. 在床上听一些轻音乐。