Exercises — Chapter 6

Sleep, Exercise, and the Biology of Learning: The Non-Negotiable Foundations

Instructions

These exercises are designed using the principles taught in this book. The act of completing them — especially the ones that require you to generate answers from memory — is itself a powerful learning strategy. Don't skip to the answers. The struggle is the point.

Exercises progress from foundational recall to application and analysis. If you're short on time, prioritize exercises marked with a star (★).

Section A: Foundational Understanding (Recall and Comprehension)

Exercise 1 ★ — Sleep Stage Functions

Without looking back at the chapter, fill in this table from memory:

Check your answers against Section 6.1. Pay attention to which cells you left blank — those represent retrieval failures that tell you where to focus your review.

Exercise 2 ★ — Key Term Recall

Define each of the following terms from memory. Then check your definitions against the vocabulary table at the beginning of the chapter.

a. Memory consolidation b. BDNF c. Hippocampus d. Cortisol e. Adenosine f. Chronotype g. Synaptic homeostasis

Exercise 3 — Term Matching

Match each term to its definition without looking at the vocabulary table:

Answers: 1-e, 2-d, 3-a, 4-f, 5-b, 6-c, 7-h, 8-g

Exercise 4 — The USB Drive Analogy

The chapter uses an analogy comparing the hippocampus to a USB drive and the cortex to a hard drive. In your own words, explain:

a. What does the "data transfer" represent in terms of memory? b. What happens if you "pull the USB drive out before the transfer is complete" — i.e., don't sleep? c. When during sleep does this transfer primarily occur? d. How does this analogy connect to the concept of memory consolidation from Chapter 2?

Exercise 5 — True or False

Mark each statement as true or false. For false statements, explain why.

a. REM sleep occurs primarily in the first half of the night. b. Chronic sleep deprivation impairs cognitive function even when the person feels "fine." c. Adenosine is the hormone primarily responsible for the stress response. d. A 20-minute nap is long enough to enter slow-wave sleep. e. Exercise promotes neurogenesis in the hippocampus. f. Cortisol is always harmful to learning. g. The post-lunch dip in alertness is entirely caused by eating lunch.

Answers: a-False (REM concentrates in the second half), b-True, c-False (adenosine creates sleep pressure; cortisol is the stress hormone), d-False (20 minutes reaches Stage 1-2 only), e-True, f-False (acute cortisol enhances focus; chronic elevation is harmful), g-False (it's driven by circadian rhythms, not just food)

Section B: Application and Analysis

Exercise 6 ★ — Diagnose the Schedule

For each student below, identify the biological problems in their routine and predict how it will affect their learning. Be specific — name the mechanisms.

1. Aaliyah studies from 10:00 PM to 2:00 AM every night, sleeps from 2:30 AM to 7:00 AM, and drinks a large coffee at 4:00 PM to get through evening classes.

2. Ben gets 8 hours of sleep but never exercises. He drives to campus, sits in lectures, sits in the library, sits in his dorm. His only physical activity is walking to the dining hall.

3. Carmen sleeps 9 hours on weeknights but stays up until 3:00 AM on Friday and Saturday and sleeps until noon. She calls this "catching up."

4. Devon exercises every morning at 6:00 AM (great!) but schedules all his hardest studying from 8:00 PM to midnight, despite being a natural morning person.

Exercise 7 ★ — The All-Nighter Cost-Benefit Analysis

You have an exam at 9:00 AM tomorrow. It's 11:00 PM. You've studied well during the week but feel like there are two more chapters you haven't reviewed thoroughly. You have two options:

Option A: Pull an all-nighter. Study the two chapters from 11:00 PM to 6:00 AM, then get ready for the exam.

Option B: Review the two chapters for 45 minutes (using retrieval practice, not rereading), sleep from midnight to 7:00 AM, and spend 30 minutes on a quick brain dump before the exam.

Using at least four specific concepts from this chapter, write a paragraph arguing for Option B. Address what the all-nighter costs and what sleep provides.

Exercise 8 — BDNF and the Student Athlete

A common stereotype is that student-athletes are academically weaker than non-athletes. Using the neuroscience from Section 6.3, construct an argument for why regular exercise could actually give student-athletes a cognitive advantage — assuming they also get adequate sleep. Your answer should reference BDNF, neurogenesis, and at least one other mechanism from the chapter.

Exercise 9 — The Stress Cycle

Draw or describe the vicious cycle connecting stress, sleep, and academic performance. Start with "Student falls behind in coursework" and trace the biological cascade through at least four steps, naming specific mechanisms (cortisol, HPA axis, slow-wave sleep disruption, hippocampal impairment, encoding failure). Then identify at least two intervention points where the cycle could be broken.

Exercise 10 ★ — Circadian Schedule Design

You are a night owl (late chronotype). Your class schedule is: - MWF: Biology at 8:00 AM, History at 11:00 AM - T/Th: Chemistry at 9:30 AM, Lab at 2:00 PM

Design a study schedule for a typical Tuesday that: - Protects at least 7.5 hours of sleep - Includes exercise - Places your hardest studying during your circadian peak - Includes a stress-reset activity - Manages caffeine appropriately

Explain your reasoning for each scheduling decision using concepts from this chapter.

Exercise 11 — Napping Protocol Design

For each scenario, recommend a specific napping strategy (duration, timing) and explain your reasoning:

a. A student has a big exam tomorrow and studied all morning. It's 1:30 PM and she's fading. b. A student is learning a new piano piece and wants to consolidate the motor memory. c. A student feels exhausted at 5:00 PM and is considering a nap before evening study. d. A student has been sleeping only 5 hours per night all week and wants to "catch up" with a long Saturday nap.

Exercise 12 ★ — Caffeine Audit

Track your caffeine intake for one day (or recall yesterday's intake). For each caffeinated drink, note: - What time you consumed it - The approximate caffeine content - Whether it fell within 6 hours of your bedtime

Then answer: a. Is any of your caffeine likely interfering with your sleep architecture? b. Based on the half-life of caffeine (5-7 hours), how much caffeine was still in your system at bedtime? c. What's one change you could make to your caffeine timing?

Exercise 13 — The James Okafor Redesign

Rewrite Dr. Okafor's exam week scenario from Section 6.2, but this time have him make biologically optimal decisions. What would his last 48 hours before the clinical skills exam look like if he prioritized sleep, exercise, and stress management while still studying effectively? Be specific about timing, activities, and the biological reasoning behind each choice.

Section C: Synthesis and Transfer

Exercise 14 ★ — Teach It

Choose one of the following topics and explain it in writing to an imaginary friend who has never taken a biology or psychology course. Use at least one original analogy (not one from the chapter):

a. Why sleep is essential for memory consolidation b. How exercise physically changes the brain in ways that support learning c. Why chronic stress makes you worse at remembering things you've already learned

Exercise 15 — Cross-Chapter Connections

Answer each question, drawing on concepts from both this chapter and previous chapters:

a. In Chapter 2, you learned about the encoding specificity principle. How might sleep deprivation interact with encoding specificity to produce even worse exam performance? (Think about the state you're in when encoding vs. when retrieving.)

b. In Chapter 2, you learned about the testing effect and reconsolidation. How does sleep fit into the reconsolidation process? What happens when you retrieve a memory, strengthen it through the testing effect, and then sleep?

c. If spacing (Chapter 3) works partly because it allows forgetting and effortful retrieval, and sleep provides consolidation between spaced sessions, what does this suggest about the ideal timing of spaced review sessions relative to sleep?

Exercise 16 — Myth Busting Conversation

Your roommate says: "I function fine on 5-6 hours of sleep. Some people just don't need as much." Using evidence from this chapter, write a response that: - Acknowledges that some individual variation in sleep need exists - Explains the Van Dongen (2003) finding about why people think they're fine on 6 hours - Describes what is being sacrificed cognitively even when someone feels adapted - Suggests a concrete way your roommate could test whether they're actually performing optimally

Exercise 17 — The Nutrition Skeptic

A friend wants to buy an expensive "brain supplement" that claims to improve memory and focus. Based on Section 6.7, help your friend evaluate this decision:

a. What does the evidence actually support regarding nutrition and cognition? b. What are the "free" cognitive enhancers that have much stronger evidence? c. How would you advise your friend to spend the $40/month they'd spend on supplements?

Section D: Reflection and Metacognition

Exercise 18 ★ — Sleep and Exercise Audit

Reflect honestly on your current habits. Answer each question:

a. How many hours of sleep do you typically get on weeknights? Weekends? b. How consistent is your sleep-wake schedule (within 30 minutes vs. 2+ hours of variation)? c. How many times per week do you engage in at least 20 minutes of moderate exercise? d. On a scale of 1-5, how would you rate your current stress level? e. Based on this chapter, identify the single biggest change that would most improve your learning biology. Why that one?

Exercise 19 — Confidence Calibration

Before you take the Chapter 6 quiz, predict your score (as a percentage). Write it down. After taking the quiz, compare your prediction to your actual score. Were you overconfident, underconfident, or well-calibrated? This is continued practice for the calibration skills you'll develop in Chapter 15.

Exercise 20 — The Priority Test

Rank the following from most to least important for learning, based on the evidence in this chapter. Then explain your ranking:

a. Using retrieval practice instead of rereading b. Getting 8 hours of sleep c. Exercising 3 times per week d. Taking a brain supplement e. Studying during your circadian peak f. Managing chronic stress

Hint: There's a defensible argument that the biological foundations (b, c, f) are prerequisites for the cognitive strategies (a, e) to work — but the cognitive strategies are themselves powerful. How do you weigh infrastructure vs. strategy?

Exercise 21 — One-Week Experiment Design

Design a one-week self-experiment to test the impact of one biological change on your learning. Choose ONE of the following:

a. Adding 1 hour of sleep per night (going to bed earlier) b. Adding 3 exercise sessions (20 minutes each) c. Eliminating caffeine after 2:00 PM d. Studying during your circadian peak instead of at your current time

For your chosen experiment: - What specifically will you change? - How will you measure the outcome? (quiz scores, subjective alertness ratings, retrieval practice accuracy?) - What will you hold constant? - What's your prediction?

Exercise 22 — Forward-Looking Application

Chapter 7 will cover the specific learning strategies that work best (retrieval practice, spacing, interleaving, elaboration). Before reading it, make a prediction: Based on what you've learned about sleep and consolidation in this chapter, when during the day would be the ideal time to do spaced retrieval practice of material you learned the previous day? Write your reasoning. After reading Chapter 7, compare your prediction to the evidence.

Exercise 23 ★ — The Two-Minute Brain Dump

Close all materials. Set a timer for two minutes. Write down everything you remember from Chapter 6. Don't worry about organization — just dump everything you can recall onto paper.

Then review the chapter summary and identify what you missed. Those missing items are your priority for review.

Exercise 24 — Integration Reflection

Write a paragraph answering this question: Before reading this chapter, what was your attitude toward sleep, exercise, and stress management as they relate to academic performance? Has anything changed? If so, what specifically changed your mind? If not, what would it take?

Exercise 25 — The Hardest Question

This is deliberately challenging. Take your time.

A student argues: "I know sleep is important for consolidation, but I have so much material to cover that I literally cannot fit in 8 hours of sleep and still study everything I need to. The trade-off is worth it."

Write a response that: - Takes the student's concern seriously (they may genuinely have too much to do) - Explains why the trade-off almost never goes in the direction they think it does - Proposes a specific alternative approach that fits more effective learning into less time without sacrificing sleep - References at least three concepts from this chapter and one from Chapter 2