In dim evening light, a person's melatonin level rises and they begin to feel sleepy. When they sit under bright lights in the evening, their melatonin level stays lower and they feel sleepy later.
Explain how this example shows internal and external influences on sleep working together.
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.