Elif has been diagnosed with both sleep-onset insomnia and sleep-maintenance insomnia. She changes her evening routine to try to discover what is causing her sleep difficulties. The table shows her average results for each of two weeks.
| Week | Caffeinated drinks after 16:00 per evening | Screen use in the final hour before bed (minutes) | Delay before falling asleep (minutes) | Number of awakenings per night |
|---|---|---|---|---|
| 1 | 2 | 50 | 82 | 3.1 |
| 2 | 0 | 10 | 24 | 3.0 |
Using the results, explain two reasons why the evidence is not enough to decide what caused Elif's two forms of insomnia.
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.