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When I slept outside in central Europe, I often recognized extremely loud snoring noises. It's not really rattling but more like rhythmical breathing. I heard it as a kid for the first time and I remember that it scared the hell out of me :)
What animal can cause such noises?
Worth to mention: a mate once told me that hedgehogs can sleep very loudly. However, as I've researched a little bit, it doesn't seem to be true (but can't really figure out a definite answer).
I've experienced similar noises at night. I'm guessing what you're hearing are deer. Deer around the world make a wide variety of noises. I'm in N. America and the deer in my area make a loud snorting sound at night, especially if you set up on or near one of their game trails. Here's a link to a video where you can hear a lot of different examples. https://youtu.be/UO6FvalHULo
