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Bracken.
I remember gathering a big pile of that to put under my tent before pitching, many years ago, then getting home and hearing a warning on the news about bracken spores being carcinogenic, and the previous weekend having been the peak time of the year for them.
I think you would need ot inhale a lot of them to have an effect, but I've been a bit wary of the stuff since.
Also it's hard to find in places like bus shelters and parks, where I often end up 'sleeping'.
I've also been lured by the packable inflatable mattresses and they're ok but in my experience nothing beats natural foliage. When wild camping look for a spot with lots of soft leafy branches/shrubs and you really don't need many to cover the area where you sleep. My favourite is ferns and I used to make a very comfy pile that I would then pitch my solo tent over. The result was an excellent mattress that also offered some insulation. Would recommend.
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