Tracking your sleep is nothing new, we’ve had it on our fitness bands and smartwatches for a while. Even the idea of laying something under your bedsheets is an area that’s already been tackled (hello Beddit). So, what really sets Luna apart? Well, one of its coolest features is how it learns your sleep routine and heats up the mattress to an optimum temperature. It’ll even let you set two temperatures for each side of the bed. It’ll track all your sleep states, like heart rate, breathing and so on, while the alarm should, in theory, wake up feeling refreshed.