Mia and Zara fly from London to Dubai for a holiday. Mia spends every morning outside in the sunshine and adjusts to local time within two days. Zara stays in her dark hotel room until the afternoon and takes much longer to adjust.
Explain one reason why light as a zeitgeber could explain the friends' experiences and one reason why it may not be the only explanation.
48 exam-style questions on Edexcel GCSE Psychology 9.1 Sleep and dreaming, covering 9.1.1 Functions, features and benefits of sleep, 9.1.2 Internal and external influences on sleep, 9.1.3 Sleep disorders, 9.1.4 Freudian theory of dreaming (Freud, 1900), and 9.1.5 Activation Synthesis Theory (Hobson and McCarley, 1977). Each one has a worked solution and a mark scheme showing where the marks go.