Finding the right temperature in bed can be tricky. Feeling too hot or cold makes it tough to drop off and can wake you prematurely. Since our mental and physical health depends on sleep, that’s a problem. Eight Sleep has the answer. The Eight Sleep Pod 4 is a temperature-regulating mattress cover that tracks your body as you snooze, with a hub that pumps cooled or warmed water into the cover to help you stay in the land of nod for longer.
When I tested its predecessor, the Eight Sleep Pod 3 (7/10, WIRED Recommends), I was wary of the billionaire biohacking buzz, but it won me over. Aside from the increased comfort, the best sleep trackers all told the same story: My wife and I slept longer and got more deep sleep and REM with the Eight Sleep Pod than without. The Eight Sleep Pod 4 brings some welcome improvements, including greater comfort, quieter operation, and handy tap…
