I finally remembered to go back to listen to this one... forgot it last night.
It seems to me many of them are using your snoring and breathing to let their voices ... "ride" on it so to speak if that's the right word/analogy. If so, it seems that if you do end up doing a Q&A EVP session someday, you may want to have some type of white noise or something going during it... There are a lot of ways to make white noise if you don't have a sound machine with it ( or a rain sound machine etc )... tune a radio to somewhere off channel, or an old TV set to a channel without a station on it are a couple of ways. Those are perfect white noise generators but I think they'd work in a pinch.
Still it's cools stuff and thanks for sharing it...