Toss and turn. Count sheep. Stare at the ceiling. Sigh when looking at the clock on the nightstand. Read a book. Or simply give up and phone-scroll. Let’s face it: Falling asleep can be difficult.

You know that strange moment when you’re half-asleep and suddenly feel like you’ve just tripped off a cliff? Your body jerks, your heart skips a beat, and you wake up slightly embarrassed even though ...