C1 The "vampire economy"

There is a new group of buyers emerging - those who purchase items online between 11pm and 5am. Dubbed the 'vampire economy', some companies are targeting this group with marketing emails sent during the night.

http://www.bbc.co.uk/programmes/p04dbjy8?intc_type=singletheme&intc_location=radio4&intc_campaign=radio4infour&intc_linkname=audioclip_vampireeconomy_contentcard1