A sleep researcher records Sofia's first and fifth sleep cycles during one night. Each cycle lasts approximately 90 minutes.
| Sleep cycle | Time in deep NREM sleep (minutes) | Time in REM sleep (minutes) |
|---|---|---|
| 1 | 32 | 9 |
| 5 | 4 | 38 |
On a similar night, the researcher plans to wake Sofia once, at a randomly chosen minute within either her first or her fifth sleep cycle.
Using the data and your knowledge of the sleep cycle, explain how Sofia's sleep changes across the night and which cycle the researcher should choose to give the greatest chance that she reports 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.