Why can't I / haven't I had an out of body experience?

I meditate for a long time every night. I listen to multiple meditation tracks and get into a deep trance.

I however rarely get vibrations and I have never once appeared out of body.

Last night I meditated for at least 4 hours and had vibrations/motion sensations about 4 times.

What am I doing wrong? I have known about O.B.E for around a year now and still have not had one.

Is there anything I should do with my body or anything? When I do it I lay in bed with one pillow, a duvet, and a blanket. I use my i-pod to listen to the tracks. I don't have any other technology on. My brother sleeps in a bed adjacent to mine. He has not had an OBE yet either, and we have been aware and trying for the same amount of time.

Please help me....

Love & Light