For anyone who has ever had insomnia, this study reported in today’s Times.

What they found was that subjects took slightly longer to fall asleep on nights they were instructed to distract themselves by counting sheep or were given no instructions at all. But when they were told to imagine a relaxing scene — a beach, for example — they fell asleep an average of 20 minutes sooner than they did on other nights. Counting sheep, the scientists suggested, may simply be too boring to do for very long, while images of a soothing shoreline or tranquil stream are engrossing enough to concentrate on.