Reader AmiMoJo writes: A sleep-tracking tech start-up founded by a Briton, which was one of Kickstarter's biggest success stories, has collapsed. Hello raised more than $2.4m (1.9m pound) for its Sense bedroom monitor via the crowdfunding site in 2014, and went on to attract a further $40.5m. Private backers included Singapore's sovereign wealth fund Temasek and Facebook Messenger chief David Marcus. Hello confirmed it would "soon be shutting down", via Medium's news site. The equipment produced a unique score for the previous night's sleep and aimed to wake the owner up at the best point in their sleep cycle.