Nighty: Sleep Cycle Calculator
Sleep Timing, Simplified
About
This app helps you time your sleep and wake-up schedule based on natural sleep cycles. It offers two simple modes, wake-up and bedtime, and accounts for the time it takes to fall asleep. All calculations are done on-device for privacy.
What's New in Nighty
1.1
March 30, 2026
Personalize Your Highlighted Cycle • Choose which sleep cycle to highlight by default — pick the number of cycles that works best for your schedule. Rate Nighty & Get Support • Enjoying the app? Leave a rating right from Settings. Need help? Tap to send a support email. Easier Settings Dismissal • Added a Done button to the Settings sheet so it's always easy to close.
MoreFAQ
How does Nighty calculate sleep cycles?
Nighty suggests sleep and wake times based on the model of natural sleep cycles, which typically occur in approximately 90-minute periods. Waking near the end of a cycle is generally perceived as easier than waking during deep sleep.
Does Nighty track my sleep?
No, Nighty does not track your sleep. It is designed as a simple calculator that provides suggested times without requiring any journaling, sleep tracking hardware, or personal data.
Is Nighty private and secure?
Yes, Nighty is designed for privacy. All calculations are performed on-device, and no personal data is collected or shared.
What is 'sleep latency' and how does Nighty use it?
Sleep latency is the time it takes for you to fall asleep. Nighty factors this into its calculations and allows you to adjust it in the settings if your typical sleep latency differs from the average.
Can I customize the wake-up times suggested by Nighty?
Yes, Nighty presents multiple cycle options starting from your chosen time. While five cycles (approximately 7.5 hours) are highlighted by default, you are free to choose the duration that best fits your schedule.
What devices does Nighty support?
Nighty is currently supported on iPhone devices.
How often is Nighty updated?
The latest version of Nighty is 1.1, and it was last updated on March 30, 2026. This suggests a recent update, indicating ongoing development and support.
What is the user rating for Nighty?
Nighty has received an excellent rating of 5.0 stars from 4 ratings, indicating a very positive reception from its users.