What do Aliens in dreams mean?

Aliens in a dream can represent:
Strangeness
New or unknown
Dreaming of Aliens may represent something that you don't understand/are afraid of but also very curious about.
Are you feeling out of place/like an alien in a foreign country?
Are you afraid of your new surroundings?
Do you feel that your space is being invaded or taken over? 
Have you been feeling 'alienated' lately?

See also 'Extraterrestrial'