After a long, tiring week, the only thing you want to do on Saturday is sleep in as late as possible before rolling out of bed for a boozy brunch. However, you might want to reconsider the seemingly harmless (and well-deserved) treat of sleeping in. According to the Sleep Foundation, the recommended sleep range for adults (age 18 to 64) is seven to nine hours per night. Even though it’s tempting to make up lost time by sleeping in on the weekend, we recently learned that switching up your schedule could actually hurt your snooze quality during the week. Here’s what you need to know.