It may be worthwhile thinking about a few other things it could be (I'm not saying it wasn't aliens) but I have learnt a lot about all of the different experiences that are possible.
Two weeks ago i met a person and he swore he had been taken and we discussed it and came to the conclusion it was an astral overlay memory. This is because it seemed a bit disjointed (the dimensions of the room were wrong) These astral memories are very real because they actually did happen (but to someone else)
Every thought, feeling, dream, experience is in the astral realms and is extremely close to us when we are asleep, we can even dream ourselves into the astral...this is because each person has an astral body and as we sleep it starts to blend (sometimes more easily than others) with all of the experiences in the astral.
Often when I'm working with people who have abduction experiences there are definitely things which can indicate an abduction or astral experience.
I am mentioning it because I feel its very important for people to know they arnt always victims to the abduction phenomenon and that there are other possibilities. Another possibility is also when a spirit enters the house and influences the dream state. (this is also common).
I have also seen people astralling and leave their bodies and move to other peoples houses and walk around. Its a strange world isnt it.