Feeling extra peeved? The quantity of sleep you got yesterday would be to blame.

We’ve all been “hangry”-so hungry we’re angry-but now there’s another kind of next-level irritability: feeling “slangry,” or?upset due to lack of sleep. Scientists at Tel Aviv Sourasky?Clinic studied the brain activity of adults as they tried to?memorize numbers superimposed on either unpleasant or neutral?images, once after a full night’s rest and again after being awake for?a day.

3o Sleep Hacks for the Most Restful Night Ever

After no sleep, the amygdala-the brain area that processes?emotion-showed higher amounts of activity in reaction to both types?of images. “We’re not able to regulate our emotional responses?without sleep,” explains study co-author Eti Ben-Simon.