This guide helps chemotherapy patients manage insomnia, a common treatment side effect that can impact recovery and quality of life. It provides practical sleep hygiene strategies including avoiding caffeine 6 hours before bedtime, establishing consistent bedtime routines, staying away from screens before sleep, exercising during the day but not within 3 hours of bedtime, and considering over-the-counter melatonin. The material emphasizes coordinating all medications with the care team for safety.