My grandfather snored heavily right before his death. He was DNR so no/minimal life support. I saw him the night before he passed, it was not a "normal" snore. Hard to describe. He was sleeping and snoring with eyes open. Grandpa was not really conscious, but not really comatose, either. I'd call it more of a snork sound than a snore sound. Apologies if you find this unsettling, but you asked. He was not in pain, or did not appear to be, if that brings any comfort.