The full moon affects your sleep negatively, according to a study conducted by the University of Gothenburg in Sweden.

The study that was published in the journal Current Biology looked at 47 healthy 18-30 year-olds and found that not only did participants sleep for a shorter period on average during a full moon, but they also struggled to fall asleep.

“Subjects slept an average of 20 minutes less and had more trouble falling asleep during the full moon phase,” says researcher Michael Smith.

Here are 3 Tips For Better Sleep.