Apps can't properly measure how you sleep

Do you also keep track of how well you sleep at night with your phone or smartwatch? In that case, we have bad news for you According to sleep researcher Sebastiaan Overeem of TU Eindhoven & Sleep Center Kempenhaeghe, gadgets that claim to measure your sleep are often not good at all! In fact, they don't measure sleep themselves at all. See how you can measure your sleep properly in the video. #sleep

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