The client is still unable to sleep despite following the progressive muscle relaxation technique routine taught by the nurse. Which action should the nurse take first?

The nurse's initial step should be to assess the client's adherence to the original instructions. By asking the client to describe the routine they are following, the nurse gains more specific information than relying solely on a sleep diary. This information will help the nurse identify any deviations or areas needing adjustment in the technique. Encouraging the client to persist with an unsuccessful routine without evaluation is not beneficial. Adding regular exercise, although important for overall sleep health, should come after ensuring the correct execution of the relaxation technique.