A participant spends four days in constant darkness. Each day, the time at which they first feel sleepy is recorded.
| Day | Time first feeling sleepy |
|---|---|
| 1 | 22:00 |
| 2 | 22:20 |
| 3 | 22:40 |
| 4 | 23:00 |
Explain what the pattern suggests about the participant’s endogenous pacemaker. Predict how a regular cue of morning daylight would affect the timing of their sleepiness.
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.