Best Sleep Times - Sleep Cycle Calculator

Calculate your optimal bedtime and wake-up times using our free sleep cycle calculator based on 90-minute sleep cycles. Explore 140+ expert articles on sleep science, circadian rhythms, and sleep optimization.

Sleep Tools

• Sleep Cycle Calculator
• Nap Timer
• Chronotype Quiz
• Chronotype Routine
• Sleep Tracker
• Sleep History
• Sleep Efficiency Calculator
• Daily Routine Generator
• Sleep Tips Quiz

Sleep Rules & Methods

• 10-3-2-1-0 Rule for Sleep
• 10-4-2-1 Rule for Sleep
• 3-2-1 Method Bedtime
• 3-3-3 Rule for Sleep
• 3 Hour Rule Before Bed
• 4-7-8 Sleep Trick
• 5-3-3 Rule for Sleep
• 80/20 Rule for Sleep
• Navy SEAL Sleep Technique
• Ninety Minute Rule
• Sleepmaxxing Guide

Sleep Science & Stages

• Sleep Cycles Science
• Sleep Stages Explained
• 90 Minute Sleep Cycle
• What Is a Sleep Cycle
• REM Sleep Explained
• Deep Sleep Guide
• Deep vs Light Sleep
• REM vs Deep Sleep
• Core Sleep vs REM
• Types of Sleep
• Healthy Sleep Cycle
• Hardest Sleep Stage to Wake From
• 40 Minutes of Deep Sleep
• Signs of Poor Core Sleep
• Sleep Inertia
• Sleep Latency
• Sleep Pressure & Adenosine
• Sleep Time Calculator Guide

Cortisol & Hormones

• Cortisol Awakening Response
• Morning Cortisol Spike
• Morning Cortisol Management
• 3am Cortisol Spike
• 21-Day Cortisol Cleanse
• Sleep and Cortisol Levels
• Sleep and Hormones
• Sleep and Testosterone

Circadian Rhythm

• Circadian Rhythm
• Circadian Rhythm, Mood & Focus
• Circadian Anchoring
• Circadian Lighting
• How to Reset Your Circadian Rhythm
• Chronotypes Explained
• Social Jet Lag
• Jet Lag Explained

Sleep Disorders & Issues

• Insomnia
• Sleep Apnea
• Delayed Sleep Phase & ADHD
• Sleep Paralysis
• Hypnic Jerk
• Sleep Bruxism
• Night Terrors
• Sleepwalking
• Sleep Talking
• Microsleep
• Sleep Regression in Adults
• Waking Up Every 2 Hours
• Signs of Poor Sleep Quality
• Sleep & Alcohol Withdrawal
• Caffeine Sensitivity & Sleep
• Screen Addiction & Sleep

Sleep & Health

• Sleep and Anxiety
• Sleep & Mental Health
• Sleep Mental Health Guide
• Sleep and Memory
• Sleep and Immunity
• Sleep Immunity Guide
• Sleep and Heart Health
• Sleep and Gut Health
• Sleep and Skin Health
• Sleep and Muscle Growth
• Sleep and Creativity
• Sleep and the Aging Brain
• Sleep and Exercise
• Sleep and Weight
• Sleep, Weight & Metabolism
• Sleep and Productivity
• Sleep Productivity Guide
• Sleep and Meditation
• Sleep During Pregnancy
• Sleep and Hormones

Sleep Optimization & Habits

• Sleep Hygiene Tips
• Best Evening Routine
• Power Down Routine
• Morning Habits for Better Sleep
• Best Time to Sleep and Wake
• Best Sleep Positions
• Sleep Positions for Pain Relief
• Revenge Bedtime Procrastination
• Number One Sleep Killer
• Why You Wake Up Tired
• Lying Down vs Sleeping
• Train Your Body for Less Sleep
• Stress, Anxiety & Sleep
• 10pm to 7am Sleep
• Is Six Hours of Sleep Enough?

Naps & Alternative Sleep

• The Perfect Nap
• Best Nap Length
• Naps vs Night Sleep
• Nap Strategies for Professionals
• Biphasic Sleep
• Polyphasic Sleep
• Second Sleep History
• Weekend Sleep Patterns

Sleep Environment

• Sleep Environment
• Sleep Sanctuary Design
• Temperature and Sleep
• Humidity and Sleep
• Weighted Blankets Guide
• Mattress Guide
• Music and Sleep
• White Noise vs Silence

Food, Drink & Supplements

• Caffeine and Sleep
• Alcohol and Sleep
• Foods Before Bed
• Melatonin Guide
• Sleep Supplements Guide
• Intermittent Fasting & Sleep

Technology & Tracking

• Blue Light & Sleep
• Phone Before Bed
• Sleep Tracking Apps
• Sleep Tracking Accuracy
• Sleep Tech Gadgets Review
• CES 2026 Sleep Tech

Demographics & Life Stages

• Sleep By Age
• Sleep As You Age
• Bedtime for Kids & Teenagers
• Sleep for Students
• Sleep for Athletes
• Sleep for Seniors
• Sleep for Shift Workers
• Sleep for Night Owls
• Sleep for Remote Workers
• Sleep for New Parents
• Sleep Habits by Generation
• Evening Workouts & Sleep

Dreams

• Dreams Explained
• Dream Journaling
• Lucid Dreaming

Relationships & Sleep

• Sleep Divorce
• Partner Sleep Compatibility

Sleep Debt & Recovery

• Sleep Debt Explained
• Sleep Debt Recovery

Recommended Books

• All Book Recommendations
• Why We Sleep
• The Power of When
• Sleep Smarter
• The Sleep Solution
• Deep Work

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• All Articles
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Best Sleep Times helps millions optimize their sleep with science-backed tools and 140+ expert articles.