There are many factors that affect the quality of your sleep, but neuroscientists have found that a comfortable pillow may be the most important one. In a study featuring teens from various socioeconomic backgrounds who were equipped with monitors that track sleep quality, researchers found that simply having a quality pillow made a major difference in how deep the teens slept. Considering how important sleep is for maintaining a healthy brain and processing information, perhaps it’s time to invest in a good pillow.