Crash Course Psychology #9: Sleep & Dreams

Identify the four stages of sleep (NREM-1, NREM-2, NREM-3, and REM) and describe what distinguishes each.

Explain the biological purposes of sleep, including cell repair, growth-hormone release, and memory processing.

Summarize the length and structure of a typical sleep cycle.

Play the linked Crash Course episode in class or assign it as homework before handing out the student guide, since every question depends on details from the video.

Use the editable Word file to trim or reorder the 15 questions if class time is limited, since both the worksheet and answer key are provided in .docx as well as PDF.

Pair question 13 (how REM sleep was discovered) with a short discussion of how scientific discoveries sometimes come from unexpected observations, since the answer key highlights an eight-year-old test subject.

Video-based note-taking — students extract specific facts (sleep-stage names, timing, biological function) from a documentary-style video and record them in their own words.

Scientific-concept recall — students identify the four sleep stages and the biological explanations for why sleep is necessary, as presented in the episode.

Cause-and-effect reasoning — several questions (e.g., 'Why do babies sleep a lot?') ask students to connect a sleep mechanism to its downstream effect on the body.