I've had something similar. When I was a child I would shut my eyes and see all kinds of random objects coming towards me in the darkness from a star field. I outgrew it. Not sure that helps.
I've also "heard" voices when trying to go to sleep. Not actually heard aurally but more like from inside. Voices I didn't recognize... saying things that didn't pertain to me or involve me in any way. Usually happened in times of great stress or anxiety or exhaustion.
I think it's just random phenomena... try not to let it bother you.