I am part of the Chevra Kadisha in a town with a small Jewish community and so the Metim don’t always have people to sit Shmirah the whole time until the funeral so I try to spend as much time as possible sitting Shmirah.
I feel though it would be more sustainable for me if I could do other things aside from saying Tehillim, which I know is what is usually the guidelines for Shmirah. Does anyone know of any views on this that discuss other activities while sitting Shmirah such as learning Torah?