About NightOwl Sleep Calc
Our Mission
NightOwl Sleep Calc was created with a simple goal: help people wake up feeling better by planning sleep around natural sleep cycles instead of arbitrary hour counts.
We believe that understanding your sleep patterns shouldn't require expensive devices or complicated apps. That's why NightOwl is completely free, works in your browser, and respects your privacy.
What We Offer
- Sleep Cycle Calculator: Plan bedtimes or wake times based on 90-minute sleep cycles
- Customizable Settings: Adjust sleep latency, cycle length, and wake windows to match your personal patterns
- Nap Calculator: Plan power naps, coffee naps, or full-cycle naps
- Calendar Integration: Add sleep schedules directly to your calendar
- Meme Mode: Because sleep planning doesn't have to be boring
The Science Behind It
Sleep happens in cycles that typically last around 90 minutes. Each cycle moves through different stages: light sleep, deep sleep, and REM (dream) sleep. Waking up at the end of a cycle—during lighter sleep—often feels easier than waking from deep sleep.
NightOwl uses this principle to suggest bedtimes and wake times that align with your natural sleep architecture. While individual cycles vary, planning around this pattern is a practical starting point for better mornings.
Important Disclaimer
NightOwl Sleep Calc is an educational tool designed to help with general sleep planning. It is not medical advice, and it should not replace consultation with a healthcare professional if you have persistent sleep issues, sleep disorders, or health concerns.
Sleep quality depends on many factors beyond timing, including sleep environment, stress, diet, exercise, and underlying health conditions. Use this tool as one part of a healthy sleep routine.