if your husband doesn'tsee it
maybe it is some wierd neuronal event occuring in your brain
maybe nothing serious
but perhaps a positive feedback cyle
which just runs out of control in your occipital lobe
where you process visual information
the fact it occurs in a darkened room
is consistent
becuase it would offer agood dark
backdrop
for the positive feedback to work on
otherwise you wouldn't see it
in this way it could be like the phantom
green light some people see after the sun settles
over the ocean
on a calm day at sea
most people don't see it
but some do
it is disinhibition