7. Stages in a Typical Night’s Sleep 0 1 2 3 4 5 6 7 4 3 2 1 Sleep stages Awake Hours of sleep REM

8. Stages in a Typical Night’s Sleep Hours of sleep Minutes of Stage 4 and REM 1 2 3 4 5 6 7 8 0 10 15 20 25 5 Decreasing Stage 4 Increasing REM

10. Sleep Deprivation 2,400 2,700 2,600 2,500 2,800 Spring time change (hour sleep loss) 3,600 4,200 4000 3,800 Fall time change (hour sleep gained) Less sleep, more accidents More sleep, fewer accidents Monday before time change Monday after time change Accident frequency

16. Sleep Across the Lifespan

22. Explaining Hypnosis

29. The Physiological Effects of Nicotine

32. Cocaine Euphoria and Crash

36. Psychoactive Drugs

37. Trends in Drug Use

38. Perceived Marijuana Risk