Human circadian rhythms and sleep

BBC 4 had a fascinating half-hour show yesterday, interviewing Till Roenneberg and Helen Emsellem on all sorts of fascinating new findings in the field of human chronobiology. Well worth a listen. But hurry up as the podcast is available only for another six days! (what do they do afterwards? why such a limited time? archives should be freely available forever).

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"Podcast" is the wrong word to use for a file in RealAudio format. :(