Sleeping like a stone

Watson has been sleeping deeply for the past hour and a half.  He looks relaxed as he is laying on his side.  I haven’t tried to feed him and will wait until he is awake on his own.  Still waiting for a call from the regular vet, and have posted a question on the Canine Cancer board about appetite stimulants.  I still need to Google these medications and read more about the side effects, etc.  I don’t like the option of turning to more pills, but I am not sure what else to do.  At least he is keeping down whatever is passing his lips.  I just wish he would eat.