If you’re on the hunt for healthy skin then you could do worse than look at your sleeping habits. The skin’s optimal repair time is between 11pm and 1am, so you ideally need to be in bed by then. In addition, when you’re not getting enough sleep the body’s hormones are released at the wrong levels, which can cause acne flare ups and other skin disorders. Plus, it means you’re more likely to rely on caffeine during the day and skip on exercise – both bad habits for the complexion.