Good catch. I think that's where one major artery lays (femoral artery, if I searched correctly). I am not a back sleeper but I was advised to put a hot water b

Good catch. I think that's where one major artery lays (femoral artery, if I searched correctly). I am not a back sleeper but I was advised to put a hot water bottle between my legs, to stay warm when camping in the winter. Apparently that was already well-known in medieval times.