You probably don’t need this $400 smart pillow to help you sleep better

One small joy of sleep is flipping over the pillow and feeling the relief of the cooler side. But would you pay $400 to experience that relief all the time?A French start-up called Moona is hoping that the answer is yes. Moona, which launched last week on Kickstarter and delivers in June 2018, has created a “machine learning smart pillow” that can always stay cold (or hot, if you prefer) and learn to adjust to the best temperature. The gadget tries to improve sleep quality by making