So many of us wake up in the night only to struggle to get back to sleep again - even when we're really, really tired. Why is this? Just two centuries ago it was the norm to have a 'first' and then 'second' sleep (people would even meet up, or take a walk in the middle of the night), but today, most of us don't have the luxury of time to follow this pattern. Instead, try these methods designed to help you drop off again after those annoying 'wakeups' and get the full and restful sleep you need. Practice starts at 3:35