Most students don’t get enough sleep. Preteens need 9-12 hours of sleep per night and teens need 8-10 hours (adults need 7-9 hours). Insufficient sleep increases a person’s chances of suffering anxiety, depression, attention issues and poor cognition. This one-page printable sleep tracker is perfect for a health, study skills or advisory / homeroom lesson. Students highlight the hours they sleep each night, record the totals and answer questions to assess whether they're getting enough sleep.