How to hijack your ‘caveman instincts’ to get MORE sleep WITHOUT going to bed any earlier

YOU’VE managed to get to bed before 10pm, and your alarm is set for 7am. On paper you’re staring down the barrel of a lengthy nine-hour sleep – right at the top of the seven to nine recommended hours of kip a night. But… you don’t fall asleep till gone 11pm, and wake up at…