Pretty much what the title says. Was just thinking about this today as I have a PC with an army of Ioun stones. Do they keep circling when you sleep? When you wake up and stand up would you still have they're bonuses? I know some need to attune to you for 24 hours, so I assume they do, but it seems odd as they need to orbit around your head.
They float in "a circling orbit 1d3 feet away from her head", not necessarily around it. I always picture them as almost forming a halo of sorts, and they just float in a circle right above your head while sleeping.