The document provides tips for maintaining good sleep hygiene. It states that the most common cause of insomnia is a change in daily routine. It recommends going to bed and waking up at the same time each day, exercising regularly, being exposed to outdoor light, keeping a comfortable bedroom temperature, and using relaxation techniques before bed. Activities to avoid before bed include exercise, screen time, caffeine, alcohol, and worrying about sleep. The goal is to associate the bed with sleep and develop a relaxing pre-bed routine.