Jaya takes part in a sleep study. For four days, the lighting in her room remains at the same dim level throughout the day and night, and meals are provided at different times each day.
| Day | Sleep onset time |
|---|---|
| 1 | 23:00 |
| 2 | 23:10 |
| 3 | 23:20 |
| 4 | 23:30 |
From day 5, Jaya returns home and goes outside in morning daylight at 07:00 each day.
Explain why Jaya's sleep onset time changed from day 1 to day 4.
Explain how the morning daylight is likely to affect Jaya's sleep onset time over the following days.
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.