At home, Leila normally wakes at 8.00 am. During a week-long camping trip, morning sunlight enters her tent at 5.30 am each day. By the end of the week, she wakes soon after sunrise.
Name the endogenous pacemaker that controls Leila's sleep-wake cycle.
Explain how the repeated morning sunlight has caused Leila to wake earlier.
53 exam-style questions on OCR GCSE Psychology 6.1 Key Concepts, covering 6.1.1 Functions, features and benefits of sleep, 6.1.2 Causes of sleep disorders, and 6.1.3 Endogenous pacemakers and exogenous zeitgebers. Each one has a worked solution and a mark scheme showing where the marks go.