FWIW I have had a couple of gear setups that I carried for a while litterally 24/7, even in my sleep. They were all attached to my body via neck lanyard using a breakaway clasp of various sorts with specific tension related breaking points designed specifically for preventing me from choking myself. Choking yourself in your sleep seems almost impossible however getting hung on a tree branch or something like that certainly seems reasonable, but then thats where the breakaway latch comes in to play. If/when I feel I require 24/7 gear (including during sleep) I would not hesitate to go back to the neck lanyard method... and trust me I have tried every method on earth at least twice. <img src="/images/graemlins/grin.gif" alt="" /> As always though YMMV. Good luck in your quest.
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Learn to improvise everything.