There are certain stages of astral projection. On the first stage you need to have your body feeling numb and heavy. On the second stage, you need to feel your body going through sleep paralysis. On the third stage, you need to feel the body going through vibrations and/or/both sounds, screams, music, noises. Some people experience only vibrations but no screams or noises. Some people experience screams or noises but no vibrations. Some people experience both. Every person is different.
On the fourth stage, you need to feel your body becoming weightless.
If you feel that your body is becoming weightless it means that you have already split and you are in your astral body. What you have to do is to roll off the bed. Don't think of rolling off with your mind, just actually do it. The weightless sensation is an indication that you have split. Most people don't realize that. Think about it, your physical body cannot feel weightless. But your astral body can feel weightless. That's why people can float up and down.

Thinking of floating upward is a good start. If you can get beyond the fear of not coming back(you can wake up at any time by thinking about it), then you can travel the universe. Just think in simple terms...like trying to get closer to the ceiling; then go further with each trip. Good luck.

Okay I can't say this with certainty as I am not you, but I think maybe the vibrations you are feeling are not the vibrations that are required to astral project. I say this because usually when one can feel the vibrations strong enough that are required to project it should be fairly easy to succeed in 'getting out'. Getting to the hypnagogic state to begin with & getting the strong vibrations is usually the hardest part of all. If you can master that you should be able to master astral projection. If you are getting the proper vibrations, just visualizing floating out should do it. Or you can try many other methods (roll out, swing out, sink out, or the rope technique etc).
There are different sorts of vibrations that you can feel. Some vibrations are easy to feel during meditation where you feel like tingling vibrational energy all through you while you're deeply relaxed. You can also feel like waves or pulses of vibrational energy flowing through you. But the vibrations to project feel somewhat different. They are far more powerful & intense than these other vibrations. Idk exactly what's happening with you though. I think you're on the right path anyway. Keep experimenting with it & see where it goes.
EDIT: Oh also lucid dreams are a gateway to the astral realms. So that's another option, that doesn't require the vibrational stage at all.
http://www.consciousdreaming.com/lucid-dreaming/lucid-dream-resources.htm
http://www.spellsandmagic.com/astral2.html

Maybe your mind is active. An active mind what messes up most people in the vibrational stage. They start thinking "OMG, I'm doing it" "Yay!... oh wait, no thinking, stop thinking",,, etc
You should keep your mind clear and NEVER think/feel/etc about your physical body. Think about blue sheep if you have to keep your mind off of your body.
Hmmmm, so you get the floating feeling?? Congrats!
Once you get the floating feeling, do one of these two things:
1.
Do nothing, just let the separation process happen. Keep your mind clear.
2.
(This is what I do - works great for me)
When you get the floating feeling and even before it...... feel your lungs being filled up with helium. Feel yourself getting lighter and lighter like a balloon. Feel yourself with each breath you take that you are getting lighter and floating slowly up.
Breathe in - feel yourself getting lighter.
Breathe out - do nothing. just enjoy the floating feeling
This will make the floating feeling STRONG. REALLY REALLY strong. You will then feel the seperation taking place and it is VERY IMPORTANT here that you do not think of anything. Just stay focused on staying focused.
3.
You can say a mantra before or during the vibrational stage.
You can find these astral projection mantras in the Astral projection/OBE course on gnostic web.
(or just do a simple good search for astral projection mantras) Gnosticism mantras work very well.
http://www.gnosticweb.com/dreams-and-obes-course

hey you seem to know a lot, i am a beginner for astral projection and i have read up and researched all about what to do etc. and everytime i hit the vibrational stage i tend to not be able to leave my body either i've tried all sorts of techniques e.g the rope, floating, rolling out etc. but it just doesn't seem to work DX also i am having extreme trouble relaxing my face because everytime i relax my face my eyes open then i have to slightly tense up just to keep them shut...

hey how are lucid dreams another way of astral projection? I don't get it. How do you astral project during lucid dreaming then????

I am trying for the first few times as well. However When i get to the vibrations My eyes begin to open on their own will, and the effort to keep them shut messes it all up! Also I have gotten to points where i lose all sense of my body but this only lasts a few moments before i regain my awareness of it. And i had a few experiences where my arms feel like they are numb and feel like thy stretch far longer than they should... is all this normal?

I am also have a similar problem with my yes opening... Please tell me if you got around this and if so...how?

id like to know how intense is the vibration stage....does eyes also vibrate....i experience vibration but only on my legs and feet only...is this the vibration your talking about?

What i've found that helps me is after I've reached the hypnagogic state, is to start repeating mantras in order to stay focused, while doing so, start to breathe deeper and heavier. If all works well, the vibrations should get stronger. Once you get past the vibrations and/or deafening "windstorm" phase you'll hit what's known as the "quiet zone" once you hit this phase, you'll know it because all will be quiet and still and for most, the vibrations should cease. Once in this stage, use whatever method works best for you to achieve your projection.

I have been trying to astral project for about three days now, i have been using guided meditation recordings which worked really good for me the first time, i reached the videration stage im almost positive. A strong very warm tingly feeling came over me very suddenly and i was able to keep my concentration for awhile but then i lost it and ever since i havent been able to feel viberations like that, im wondering if i have fears i havent gotten over but i dont think i do, because im mainly jut curious. Any recomendations? C:

I started smoking marijuana again and during a meditation I got a GARGANTUAN vibrational in my head and felt like there was this spinning energy inside my chest area and a sense of tightness all over my body. It scared and noticed my abdomen was shaking and my heartbeat was crazy fast. I've been wanting to astral project but these vibrations usually put an uneasiness to me and I stop. Is there anyway to smooth these out? My friend (who astral projects) told me to just let it continue. But the feeling of my head cavingnin is too much and makes me stop.. I used to go through sleep paralysis when I was younger but I thought it was a medical issue. Any feedback is welcomed

Gotta write this down since i've been here Sometimes before. Last week i got into the Vibration stage through a lucid dream.
I was pretty consious during the dream and I thought well lets do it! I imagined my whole body Starting to burn with flames and stuff and then after like 10 seconds it started. The vibration was really strong and i could feel it through my whole body but then i got too excited about it and it distracted me but it still lasted in 5 minuets even with the fact that i was thinking about it all along!

For all the people wondering about the vibrational stage, like Unique Mind said, the vibrations you are feeling are probably not the ones that facilitate AP or OBEs. Usually those vibrations come after you are very very deep into the hypnagogic state.
What I would recommend and this helped me get really vivid Astral Projection experiences, is to take 3-10 mg of melatonin supplement* before you go to bed. Then set your alarm to wake up 4-5 hours after falling asleep. When you wake up, go to the bathroom, get something to drink, and when you feel tired again go back to bed and get really relaxed. Let your mind drift while pulling it back in with conscious thought. Imagine yourself sinking deeper into your bed. After staying somewhat conscious through the hypnagogic stage and I mean really deep into it , then you should begin to feel intense vibrations. In this stage all you have to do is will yourself to leave your body and it will happen. If this doesn't happen chances are you didn't get deep enough into the hypnagogic state.
It takes practice, the best advice I can give besides what I already mentioned is to keep lucid dreaming. Sometimes lucid dreams crossover to Astral Experiences.
*Melatonin is said to prolong NREM sleep so that when you have REM sleep its much more concentrated, giving more vivid experiences.