Just a quick note - thought I'd offer my two cents --
Elves.
Greys.
Different beings.
Negative greys give off a palpable evil.
The nicer greys on the nicer grey timeline/probability don't give off palpable evil and seem to have navigated beyond that level of nastiness, but they still have a very distinct vibration and energy....completely different from elves.
The nastier greys have long exploited our curiosity with the truly fascinating, beautiful, and loving races like the nature devas, gnomes, dwarves and the elves.....exploiting our desire to make contact by engaging in abduction and obfuscation the minute we're naive enough to go "I want to meet you! Come and get me!"
They are different beings.
Elves are reclusive, very rarely communicate with humans, and are slow to reveal the truth about their world, their lives, and so forth. I've been very blessed to have occasional contact with them, but even so, of all the things they have told me, they don't want me sharing their entire story with others at this time. They become very disturbed when humans with their heaviness start focusing on them -- many pagans try to invoke them in magic and bend them to their will, etc., the usual human egotistic nonsense. Who wants to deal with that? All of those collective dense thoughtforms have a very strong effect on creatures whose energy is less fully 3-D, less embedded in heavy matter. They have different bodies than us. They don't want to have a lot of people focusing on them and drawing them into 3-D when they're really more 3.5 D.
If you're experiencing a lot of obsessive fascination about nighttime visitors, etc., that means you're square in the middle of abduction stuff from various negative critters. You need to close the psychic doorways you've opened and stop messing around with stuff that can be dangerous to you. Then, after those rips and tears in your auric field have been given some time to heal, you can revisit contact with LOVING multidimensional beings safely. But once the greys have you in their sights, it's a nasty, contagious, icky vibration, and they will use all of their technology and psychic will to keep you suspended in dark fascination, obsession, passion, longing, etc. A kind of "Love bite" scenario that exploits your natural and innocent desire to contact beings different from you and turns it into an exploitative relationship where they will implant you with tracking devices, mess around with your body and organs, and sometimes even induce illness.
So -- all who are reading this thread - please be careful. If something flashy, melodramatic, or weird feeling shows up at night, that's not an elf. That's something intrusive that needs to be given a sharp kick in the ass.
My opinion, of course! Actually, more than opinion. The voice of experience. I just want you to be safe out there. You don't want to go through some of the stuff I've dealt with over the years from being TOO open, too trusting, too "Wow, I've contacted an intelligent creature that isn't human! Come on in, boys!"
That's asking for all kinds of trouble.
You need to set up a "ring pass me not" type of vibrational barrier, a clear, unbending intent in your auric field that says "All who are lower than this particular vibration (insert thoughtforms of tremendous love and integrity) DO NOT ENTER HERE." Clear willpower will do the trick, along with any prayers, visualizations, or rituals you personally resonate with.
When you're open to ANYTHING, you'll attract a mixed bag of stuff, and most of it does not, alas, have you best interests at heart.
I believe this is why in many religious traditions like Christianity there have been so many dire warnings given about not fiddling around with astrology, prophecy, metaphysics, talking with the dead, etc. It's not that THESE THINGS IN THEMSELVES ARE WRONG ('cause they're not. I do them all the time:) It's that the VERY ACT of attempting to raise your awareness to encompass other dimensional realities ATTRACTS ATTENTION.....from energy predators who will try to manipulate you and throw you off course.
So it helps to pray or invoke the highest aspects of God/Goddess/Great Spirit/Jesus/Whomever whom you personally feel to be of total, 100% integrity and love, and use this as your measuring stick.
"Test" the spirits. Just because something is coming around and it's kind of interesting and bizarre and your ego gets involved with thinking you must be so "special" because these creatures are looking you up (been there, done that, have the implant scars to prove it) doesn't mean you're necessarily contacting something good.
Measure, always, through your heart chakra. I measure entities just as I measure people, and do my best to surround myself with critters on what I perceive to be the "high" end of the scale.
The scale goes something like this.
Entities/Beings of conscious awareness (whether in a physical body or not) will usually resonate with five different vibrations:
Active, pulsating, love
Neutrality with a slightly loving aspect
Neutrality
Neutrality with a slightly hateful or "intending harm" aspect
Harmful or Hateful
If you learn to measure EVERYTHING in your life according to a scale like this and begin marshalling your will and intent to move EVERYTHING you're plugged into towards the more loving side of the scale, your whole life changes.
Mortal illness cured. (Been there, done that, got the cure - through the grace of something much higher than I can even begin to understand - but it was all about getting clear with God/Great Spirit that THAT would be the primordial ruling force in my life.)
Relationships improve, your soulmate shows up after a gazillion lifetimes of the two of you missing each other. (Been there, am in the midst of that.)
Miracles happen in your financial/logistic situation. Even if you're not sitting on a million dollars, you'll suddenly find yourself living somewhere lovely with lovely people around you and wondering "How did I get to heaven when I used to live in hell?"
So when we talk on this forum about shifting our vibrations, I believe this is both an INTENTIONAL process (that you set in motion) and also a SCREENING process (screening prospects who come close and want to be near you, whether they're friends, lovers, potential bosses/employers, or entities visiting in the night.)
Just because you're attracting attention from multidimensional energy beings does NOT mean you should just sit back and take the vantage point of someone passively watching TV. This is when you should be stepping into your power as a spiritually sovereign being and putting these entities through their paces. Test the spirits.
No loving, positively oriented being objects to this process, because they understand the psychic density surrounding the earth and the terrible predators and energy parasites that have hold on most of humanity. So loving beings will be incredibly respectful, patient, gentle and "additive' in what they bring to your life....whereas the negative critters TAKE, CONFUSE, ENGAGE IN DECEPTION...and use technology to whack you out and violate you in one form or another.
Okay, that's my vent for the day! Thanks for listening 
Best,
LipstickMystic aka Jennifer