I had problems with knee hyperextension in my previous hammock. I found that either lying in a figure-4 position (with one ankle/calf under the other knee) or using a spare piece of clothing in a stuff sack works there. I didn't need much in the way of support, but preferred the figure-4 as the sack would occasionally squirt out from under my knee. Finding it was fun when I was half-awake, but I always knew where my other foot was!
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