Aly Lopez is a writer on the sleep team at CNET. She tests, researches and reviews everything sleep-related, from mattresses and bedding to sleep trends and hacks to sleep technology and supplements.
Following this advice would mean, for instance, that for a king-size bed (150 x 200cm) you'd need a 6 x 8-metre bedroom. At the very least, you should aim for a space of 2ft 6in (76cm) between the ...