Texto
http://wsdownload.bbc.co.uk/learningenglish/pdf/2013/05/130516114829_130516_6_min_sleep_elt.pdf
Audio
http://http-ws.bbc.co.uk.edgesuite.net/mp3/learningenglish/2013/05/6_minute_english_sleeping_for_learning_for_web_130516_6min_sleeping_audio_mp3_au_bb.mp3