What features could have been used to make the text clearer?

According to the latest science reports, eight hours’ sleep per night is the new 10,000 steps (which was itself the new five-a-day), so we’d better get things sorted in the bedrooms of Britain! Dr David Campbell of the Cheltenham-based National Sleep Institute says that Britons are definitely taking more interest in how much pillow time they get. “People, especially young people who own smart sports watches or exercise wristbands, are increasingly bragging about the time they go to bed; and instead of it being in the early hours as it might have been 20 years ago, now it’s closer to 10 or even 9pm,” he says.

i would say the correct answer is not concrete.