A researcher recorded the time one volunteer spent in deep sleep and REM sleep during two cycles of the same night's sleep. Each complete cycle lasted about 90 minutes.
| Sleep cycle | Time spent in deep sleep (minutes) | Time spent in REM sleep (minutes) |
|---|---|---|
| First cycle | 35 | 10 |
| Fifth cycle | 5 | 35 |
Compare the time spent in deep sleep and REM sleep in the first and fifth cycles. Use data from the table in your answer.
On two other nights, the researcher wakes the volunteer at one randomly selected time during the first cycle and at one randomly selected time during the fifth cycle. Explain during which cycle the volunteer is more likely to report a dream.
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.