It’s no secret that going without sleep can affect people’s mood, but a new study shows it does not interfere with their ability to evaluate emotional situations.

It is often assumed that feeling more negative will color people’s experience of emotional images and events in the environment around them. However, Washington State University researchers found that while going 24 hours without sleep impacted study participants’ mood, it did not change their performance on tests evaluating their ability to process emotional words and images.
“People do become less happy through sleep deprivation, but it’s not affecting how they are processing emotional stimuli in their environment,” said Anthony Stenson, a WSU psychology doctoral student and lead author of the study in PlosOne.