Hrm...meditation. Well i know that the user Lucius can give you tons of info (look him up).

But i think that you should do whatever makes you the MOST comfortable...laying down or sitting up. be sure to keep a straight spine, though.

I personally sit cross legged, with a candle in front of me, and focus on the hypnogic (spellin?) imagery...until i sometimes go into a deep transe or 'trip'.

...but perhaps you could try focusing on your Chakras, especially your 3rd eye.

...