A PARADOXICAL KIND OF INSOMNIA Despite feeling like I hadn’t slept for much of last night, my Fitbit tracker indicated I’d actually gotten about seven hours of sleep. Thankfully, this discrepancy doesn’t occur often—perhaps once a month. I’ve since learned that this phenomenon is known as paradoxical insomnia. A recent write-up in Scientific American’s online Today in Science, titled “Up All Night,” published on June 10, 2024, discusses this condition. Here are some highlights from that short article: People with paradoxical insomnia (also called subjective insomnia) report that they’ve been awake all night, even when the polysomnography, the gold standard for...