It follows a paper, published in 2014, in which he noted that, when children are around ten, their biological wake-up time is about 6.30am; at 16, this rises to 8am; and, at 18, someone you may think of as a lazy teenager actually has a natural waking hour of 9am.

In 2014, he published a paper in which he noted that, when children are around ten, their biological wake-up time is about 6.30am; at 16, this rises to 8am; and, at 18, someone you may think is just a lazy teenager actually has a natural waking hour of 9am.
