Very weird luminous bed sheet ?? I spent the night at another place yesterday. At night, the bed sheet (which was a bit "plasticy") would shine intense greenish light when I run my hands over it. The light sometimes converges to a specific point, as if there was an LED placed underneath. if I rub the same spot again, it won't luminate as much. The light was powerful and the whole experience was weird. What made it even more strange is that this only works on the top side of the bed, i.e. under my shirt, not my pants! Is this intended by the fabric manufacturer? If so, what is this type of fabric called? I can attach a video if needed. Thanks!