Zooey Deschanel's Must Haves: From a Leather Backpack to a Smart Coffee Mug

While Deschanel notes that it's "kind of an expensive product," she says that she and partner Jonathan Scott can't live without this Eight Sleep Pod 4 Ultra ($4,599, originally $4,699) mattress cover. "It's such a game changer because if both you and your partner have different temperature [preferences], it'll adjust, and you can set it to get colder as you sleep and then get hotter when you wake up."

Pro Tip: This athlete- and celeb-approved mattress cover is designed to improve sleep quality, with personalized heating, cooling, and elevation capabilities that cater to each user's unique sleep preferences — even while they're lying next to someone else.