Circadian Sleep: A Practical Evidence-Based Guide to Your Body Clock, Sleep Timing, and Coordinated Choices for Light, Caffeine, Exercise, Meals, and Melatonin (The Practical Evidence Series)

Tired when you need to be alert, yet wide awake when bedtime arrives? (based on 120 scientific studies)

Knowing the usual sleep tips is one thing. Knowing which ones belong together, and when, is harder. A schedule that works on paper may still clash with your body clock, daily obligations, or the amount of time you actually have available for sleep.

This practical evidence-based guide draws on 120 scientific studies to help you understand your body clock, identify your timing problem, and choose a realistic starting point. It connects individual choices to the direction of your goal, so you can consider what to adjust first and what might work against that change.

Turn scattered advice into coordinated choices

• Make sense of an inconsistent sleep schedule and distinguish a timing mismatch from too little opportunity to sleep. Consider which obstacle your current routine presents.
• Understand morning light exposure and evening dimness, including why the direction of a timing change matters. Compare the role of a morning signal with the need to protect the evening.
• Explore melatonin timing, separate clock-shifting goals from sleepiness, and recognize questions that need professional guidance. Keep the option in proportion to the rest of the plan.
• Consider caffeine sensitivity alongside dose and bedtime, without assuming that falling asleep means coffee had no effect. Look at the timing of intake as well as the amount.
• Coordinate exercise and meal timing with daily obligations, while weighing what the research can and cannot establish. Focus on choices you can repeat rather than an ideal schedule you cannot keep.

Four parts move from clock fundamentals to practical timing choices, work and school constraints, and evidence on performance and health. Readable comparisons help you weigh options and tradeoffs without needing to change everything at once. Chapters on shift work and adolescent schedules show why a single set of clock times cannot fit every situation.

You do not need a perfect routine or a collection of gadgets. The book explains priorities, uncertainty, and the limits of self-help, so you can approach the next decision with clearer expectations.

Choose Circadian Sleep and start connecting the advice to the timing problem you actually face.

Table of Contents

Introduction
Part 1: How Your Body Clock Shapes Sleep
Chapter 1: Understand How Light Sets Your Body Clock
Chapter 2: Recognize Chronotype and Reduce Social Jetlag
Chapter 3: Build Regular Sleep Timing Without Chasing Perfection
Part 2: Timing Levers You Can Use
Chapter 4: Use Light and Darkness to Shift Sleep Earlier or Later
Chapter 5: Reduce Evening Blue-Rich Light Without Chasing Gadgets
Chapter 6: Use Melatonin as a Timing Tool Rather Than a Sedative
Chapter 7: Shift a Delayed Sleep Schedule with a Coordinated Plan
Chapter 8: Time Exercise to Support Sleep and Circadian Goals
Chapter 9: Move Eating Earlier When It Supports Your Goals
Chapter 10: Use Temperature to Make Sleep Onset Easier
Chapter 11: Set a Caffeine Cutoff That Fits Your Sensitivity
Part 3: When Social Schedules Fight Biology
Chapter 12: Protect Sleep and Alertness During Shift Work
Chapter 13: Help Adolescents Sleep on School Schedules
Part 4: Reading the Evidence on Sleep, Performance, and Health
Chapter 14: Recognize How Sleep Loss Affects Thinking and Performance
Chapter 15: Understand How Sleep Loss Can Change Appetite and Blood Sugar
Chapter 16: Interpret Sleep Duration, Regularity, and Heart-Health Evidence
Chapter 17: Understand What Sleep Studies Show About Immune Function
Chapter 18: Understand Sleep's Place in Mental Health Care
Conclusion
Bibliography