Cannot Get Past "Vibrations" To Astral Travel?

I've been practicing astral travel for quite some time now, and im able to get myself in a deep enough state of relaxation to the point its just before falling asleep. Then i begin to feel the vibrations or sensations through my body and sometimes my heart rate increases, but then when i try to separate my body the vibrations stop and i start to lose my concentration. So is there any particular way or suggestions i can get beyond the vibrations and actually separate myself into astral projection?
Thanks

-michael
 
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