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Photo: Crew/Unsplash

Sleep is a vital pillar of our health (shout-out to Arianna Huffington for her pro tips), but did you know it could be playing an important role in your relationships?

A new study in the Journal of Family Psychology has shown that couples who get better sleep are happier with each other—which sheds a whole new light on the side effects of being cranky.

For the study, 68 newlywed couples filled out detailed questionnaires for seven days about their sleep and relationship satisfaction, ranging from overall happiness with each other to specific experiences. The main finding? Spouses who had slept for a longer period of time were more content with their relationships.

Because sleep is a primal, self-regulating function, its benefits include feeling less annoyed (and less emotional and less scattered)—so we’re less likely to take out our crankiness on our significant other. Ever see that meme that says “Sorry for what I said when I was tired?” Yeah, we feel that.

Florida State University researchers Heather M. Maranges and James K. McNulty, the authors of the study, told Science of Us that satisfied couples “discount undesirable experiences when forming global evaluations of the relationship”—which is something that requires energy.

In other words, when you stop and question how happy you are with your love life, you’ll be more negative and critical if you haven’t had enough ZZZs. Yet another reason to hit the hay at a decent hour—your significant other will thank you.

Ready to snooze with the best of them? Here’s one habit for better sleep you might have overlooked (which your partner might love), and eight superfoods that will help get you some quality hours of shut-eye