A metal spoon

Okay, so the “eight hours a night” rule has been largely debunked ― most adults need between seven to nine hours a night, and if you don’t feel tired during the day, you’re probably doing alright.

But the problem is a lot of us ARE exhausted in our waking lives. A YouGov poll found that one in eight Brits say they’re tired all the time ― a quarter say they’re tired most of the time, while a whopping third say they’re weary half of the day.

If you’re not sure how to tell whether you’re sleep-deprived or just run-down, though, Dr Nathaniel Kleitman from the University of Chicago ― also known as “the father of sleep research” ― say all you’ll need is a spoon and a metal........

© HuffPost