Over a long period (since getting sick), I've been aware that I concentrate better lying in bed than sitting up at my desk. Just recently, it dawned on me that this might be explained by orthostatic intolerance / neurally mediated hypotension. Then by coincidence, I happened upon a video by Dr Klimas, in which she talks about using a foot-stool to raise your feet while sitting, so as to limit venous pooling within the legs. So, I have 2 questions: - Is OI/NMH the most likely explanation for better concentration while lying down? & - Do others out there experience this too?