Ive heard a couple of ME/CFS specialists suggest this lately. Im confused thou as that treatment I thought is one astronaunts use rather then ME/CFS as they develop similar after being in no gravity for a while.. but the mechanism of their POTS I thought is different to ours (rather then being caused by low blood volume). So Im wondering if anyone here has found raising the head end up bed has helped the OI? or POTS? (I used to do the opposite and raise the leg end of my bed when my POTS were severe.. as I used to be affected by dizziness all the time to the point where I'd be hanging my head over the bed to try to relieve it a bit which did help).