A psychologist investigates dreaming. She wakes every participant exactly 90 minutes after they fall asleep and immediately asks them to report any dream. She assumes that this waking time will place every participant at the same point in the sleep cycle.
State the stage of sleep in which most dreaming occurs.
Explain one problem with using this fixed waking time to collect dream reports.
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.