hi, i think Angel is right, in my experience the more i got involved in the understanding of paranormal/spirit the more occurances i seem to be having, i too on a few occassions have felt somebody sit on the bed whilst in it. one of the scareiest times, i was in bed with a bout of bad flu, it was quite late no lights on but i remember holding a tissue in one hand and drinking some water with the other, n i swear as god as my witness, i felt pressure of my figers and the tissue came out of my hand and ended up at bottom of bed, i wasnt that ill that i had imagioned it, windows where shut..... i thought of every logical explanation, but there wasnt one...
dd