heh. thanks for the advises so far, guys. 
i'm gonna go tighten all the screws inna bit, as it seems to mostly come from the 4 corners of the bed, where the head/footboards are attatched to the hm, side/base boards via metal brackety-thingies and screws. 
(god i sure sound like a girl, eh? 

 )
upon closer inspection, i see the slats UNDER the matresses have no metal parts, it's just the slats inserted in the slat-frame with a little hard plastic 'sock' in between them. 
i'll get back to ya on the status soon as i finish poking at it. 

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Therell be days/When Ill stray/I may appear to be/Constantly out of reach/I give in to sin/Because I like to practise what I preach