but even at my weight and with my protruding hip sockets, the 3.5 wasn't better than the 2.5.
Sleeping on the bare ground or on inadequate padding may cause one's restorative sleep (stages 3 and 4 if you care) to be repeatedly interrupted. Research done long ago showed that when stage 3/4 was repeatedly interrupted in a sleep lab, normal subjects felt in daytime as if they had fibromyalgia. Interrupting REM sleep did not produce that effect, though it left subjects sleepy.
So a good sleeping pad is a place where extra money may be well spent. I also suggest a small pillow filled with buckwheat, to keep your head from scrunching when you sleep on your side.
URCHIN Portable Anchor
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