There’s some truth to a tired cliché. Catching up on your beauty sleep really can make you more attractive. Sleep deprived people tend to appear tired and less healthy, therefore less attractive, Swedish researchers discovered.

In the study, a group of participants randomly rated photos of 23 men and women based on their attractiveness. Each person was photographed twice: once after a normal night’s sleep and once after sleep deprivation.

The results were clear – the sleep-deprived looked a lot less attractive in the eyes of the raters. Ratings of perceived health, attractiveness and tiredness were lower for photos taken after a sleep-deprived night.

So next time you want to impress a date, give yourself an extra hour in bed the night before. Not only will you be physically more attractive, but you’ll be in a better mood – so might leave a lasting impression.

Plus your body will thank you, after all, people who prioritize sleep are happier and have fewer health issues overall.