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Eight Sleep Pod 4 Ultra review: for sale, good night’s sleep, just $4,700

I’m only half joking when I say that Eight Sleep’s temperature-controlling mattress cover improved my marriage. A good night’s sleep is elusive in my house. I’m always cold, my spouse runs hot. We battle nightly over the thermostat. So when I first reviewed an Eight Sleep cover, it was a revelation. I could curl up and drift off into a…