Welcome to your final week of the Sleep30^® Challenge by Sleep Number. Weeks 3 and 4 can be mixed and matched. Week 3 covers how food and exercise affect your sleep. Week 4 covers mental stress and how to reduce its impact on your sleep. Below, you’ll find a simple 4-7-8 breathing technique to help you unwind, tips to help you get back to sleep, and how to feel calmer with a gratitude journal.