A research assistant removes the first 90 minutes from one full-night sleep record and the final 90 minutes from another. The assistant concludes that the omissions are equivalent because each removes one complete sleep cycle with the same pattern of stages.
Explain two limitations of the research assistant's conclusion.
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.