Lesson 5
Larks, Owls and Social Jetlag
Understand why body clocks run early or late, what weekend lie-ins cost on Monday, and how to plan around your own timing.
Predict
Leo, 19, is in his first year at university. Before 9 am lectures he goes to bed at 10:30 but lies awake until about 1.
What's most likely going on?
Choose a prediction, then select Next to see the answer.