Originally Posted by Blue Tyson
Doctor's advice is lie on your back in bed.
Then read it.
Or if you absolutely had to go out, you could wrap a bandage over your head and under your chin. Kind of like Jacob Marley in A Christmas Carol. That would prevent the dropped jaw. On the other hand, might look a bit more disturbing. Dunno.
But Blue Tyson's advice is probably best: read at home while lying down. If you did have to get up, your "jaw-dropping" would take place in a private setting. So, no worries.