A researcher records when participants first report feeling sleepy while they remain in constant darkness, with no clocks and no fixed daily routine.
| Day | Mean time participants first report feeling sleepy |
|---|---|
| 1 | 21:30 |
| 2 | 21:45 |
| 3 | 22:00 |
| 4 | 22:15 |
| 5 | 22:30 |
Use the results and your knowledge of endogenous pacemakers and exogenous zeitgebers to explain the pattern in the results. Predict, with a reason, how switching on a bright light at the same time each morning would change this pattern.
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.