A.  There is  the dark side  of dreams -  nightmares,  dreams of fear,
pain,  irrational bad feelings that often  cannot  be explained. These
can  become a serious  problem when you  often wake up terrified, when
you even don't sleep because of fear of nightmares... Nightmares occur
mostly  because   some   problem   disturbs  you  unconsciously    but
seriously. Some nightmares  carry  obvious symbols that may   indicate
where your problems are, but often it is not that easy. Sometimes they
can indicate really  serious problems like depressions, sometimes just
an inadequacy of getting along with yourself. It's difficult.