The Christmas season is over, and people across the country are heading back to work to resume their daily lives. After the excitement of the season passes, it can leave many feeling a little down.

Insomnia Cookies has announced that it is helping Americans get out of that post-holiday slump with a special deal. Customers who make a purchase at any Insomnia Cookies location from now until Monday, December 31 will receive a free cookie.

The offer is available on a variety of flavors, including Chocolate Chunk, Classic with M&M’s, Double Chocolate Chunk, Double Chocolate Mint, Oatmeal Raisin, Peanut Butter Chip, Snickerdoodle, and more.

Customers are encouraged to visit Insomnia Cookies on Facebook, Twitter, Instagram, and Snapchat (@CookiesVIP) to learn how to redeem the offer.

The latest customers to get in on this offer can be found in San Diego. Insomnia Cookies opened its latest location there earlier this month. It is the second store in the state of California following the first opening in Davis in October.