Rabbi Mansour shlita:
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Reading Tehillim at Night
It must be emphasized that on the nights when Tehillim should not be read, it is counterproductive to do so. Often, text messages go out asking people to read Tehillim on behalf of an ill patient, and sometimes these messages are received at night. One should not read Tehillim before Hasot on the nights when it is improper to read Tanach.