Downtime is important when it comes to retaining what you learn, and getting sleep in between study sessions can boost your recall up to six months later, according to new research published in Psychological Science .

In an experiment held in France, participants were taught the Swahili translation for 16 French words in two sessions. Participants in the "wake" group completed the first learning session in the morning and the second session in the evening of the same day, while participants in the "sleep" group completed the first session in the evening, slept, and then completed the second session the following morning. Participants who had slept between sessions recalled about 10 of the 16 words, on average, while those who hadn't slept recalled only about 7.5 words.