The Insider Picks team writes about stuff we think you'll like. Business Insider has affiliate partnerships, so we get a share of the revenue from your purchase. Eight Sleep Smart mattresses are the latest way to track your sleep, which can lead to a more restful night overall. Eight's Mars+ smart mattress not only tracks your sleep, but can adjust the temperature of your bed. I’ve been training for a 10k, and Eight's hybrid mattress helped relieve some of the pressure off my sore muscles. At $1,399 it’s a steep investment for a mattress, but those who are looking to hack their sleeping habits can be assured that it’s money well spent. I’ve never really been someone who has been all that interested in hacking their sleep.