Was reading dh's copy of 'Durham First' - the mag for Alumni of Durham University and came across an article about Researchers from the Sleep Lab at Queen's Campus, Stockton, working on a study to help understand how dummies affect infant sleep behaviour.
'Recent research suggests that infant dummy use may protect babies from cot death/Sudden Infant Death Syndrome (SIDS) but researchers don't yet understand the protective mechanisms that dummies trigger when babies are sleeping'
There's a link to a website if you're interested... Connect to Sleep Lab Website