Another thing a wool blanket doesn't do as well, is block the wind. I've used a wool blanket with a pad, which helped but I don't know how well it would work on its own.
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Deep peace of the running wave to you.
Deep peace of the flowing air to you.
Deep peace of the quiet earth to you.
Deep peace of the shining stars to you.
Deep peace without end to you.
adapted from - ancient gaelic runes