A.  We   occasionally  hear sayings  about  "you can't   do/see XXX in
dreams". Where  XXX is seeing colors,  seeing lights, seeing your face
in  a  mirror,  or  perhaps  a  large  number   of   variants on  this
theme.  Experience clearly proves this  tales of unknown origin wrong.
(It   may  well  be   that  people   who  actually  believe  in  these
misconceptions do have the mentioned "handicaps" in their dreams. What
they believe about dreams comes true. It's very hard to tell the cause
from the result in such cases...)