# R90 sleep assistant — Manage your sleep cycle

> App to manage sleep cycles using the R90 method for improved sleep quality. (iPhone/iPad app by 阳 孙.)

- Source: https://appshunter.io/ios/app/r90-sleep-assistant/id1527861860 (this page in markdown: same URL + `.md`)
- Developer: [阳 孙](https://appshunter.io/developer/1518808403)
- Category: Health & Fitness, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 1 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2020-08-18
- Data updated: 2026-08-21
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/r90-sleep-assistant/id1527861860/reviews.md

## What is R90 sleep assistant?

Still worrying about your sleep quality? Try the R90 sleep method to transform your sleep.
 
The R90 sleep method, developed by the Premier League Manchester United's sports sleep coach, is designed according to the human body's natural biological rhythms. This scientifically-backed solution helps eliminate external and internal distractions, allowing you to follow your body's natural patterns and achieve better sleep.
 
Human sleep consists of two types: REM sleep (light sleep) and non-REM sleep (deep sleep). These alternate in approximately 90-minute cycles. Sleep quality isn't measured by absolute duration, but by completing full 90-minute cycles. The optimal R90 sleep pattern is 35 cycles per week.
 
For example, if you typically sleep from 12:00 AM to 7:30 AM, you complete exactly 5 cycles. But if you stay up until 1:00 AM and still wake at 7:30 AM, you'll be in deep sleep when your alarm goes off. Forcing yourself awake doesn't eliminate fatigue—it actually harms your body. According to R90 principles, you should adjust to sleep at 1:30 AM for exactly 4 cycles.
 
This app helps you calculate and follow the R90 method, providing timely reminders and tracking your weekly sleep cycles.
 
Key Features:
- Record your sleep patterns automatically
- Track completed sleep cycles each week
- Plan your optimal sleep schedule
- Smart bedtime and wake time calculations
- Weekly cycle goal tracking (35 cycles per week)
 
Pro Tip:A 30-minute or 90-minute nap at noon also counts as a complete cycle.
 
Note: This app integrates with HealthKit to read and write sleep data. Permission is required for optimal functionality.

## Key features

- Calculate optimal sleep schedule
- Track completed sleep cycles
- Record sleep patterns automatically
- Smart bedtime and wake time calculations
- Weekly cycle goal tracking
- Integrates with HealthKit

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Fully unlocked | $1.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/r90-sleep-assistant/id1527861860/reviews.md

### 5/5 — 可以正向也做一个吗

*2021-05-14*

现在是起床时间倒推上床时间，都是有时候也需要正向推，这个可以开发一下吗

### 5/5 — 有可以深化的地方

*2021-01-08*

想问下开发者 是否能够同步闹钟功能呢？3块付费使用的只是一个时钟的动态效果吗？

**Developer response:** 您好，我研究下苹果有没有同步闹钟的接口，这个可能是没有开放。我这边自己使用是用“睡眠｜起床闹钟”这个功能是可以同步数据到“健康”，能够被app读取到

## Frequently asked questions about R90 sleep assistant

### What is the R90 sleep assistant?

R90 sleep assistant is an application designed to help users manage their sleep cycles using the R90 method. This method focuses on completing 90-minute sleep cycles, which are believed to be crucial for optimal sleep quality.

### How does R90 sleep assistant work?

The app calculates your optimal sleep schedule based on your body's natural biological rhythms and the R90 method principles. It provides timely reminders and tracks your weekly sleep cycles to help you achieve your goals.

### What is the R90 method?

The R90 method, developed by a sports sleep coach, is based on the human body's natural 90-minute sleep cycles (alternating REM and non-REM sleep). It suggests that sleep quality is determined by completing these cycles rather than just duration.

### Can R90 sleep assistant integrate with other health apps?

Yes, R90 sleep assistant integrates with HealthKit to read and write sleep data. This integration requires user permission for optimal functionality and allows for a more comprehensive view of your health data.

### What is the target sleep cycle goal per week?

The optimal R90 sleep pattern aims for 35 completed sleep cycles per week. The app helps you track your progress towards this weekly goal.

### Is R90 sleep assistant free to use?

R90 sleep assistant is available for free. However, it does offer in-app purchases, which may unlock additional features or content.

### What devices does R90 sleep assistant support?

R90 sleep assistant currently supports iPhone devices. It is designed to work with the iOS operating system.

### When was R90 sleep assistant last updated?

The latest version of R90 sleep assistant was updated on February 12, 2026. This indicates ongoing development and support for the application.

## Version history (last 4 releases)

### 2.0 — 2026-02-12

- Get smart wake time suggestions based on your past month's sleep patterns  
- Delete sleep records with automatic Apple Health sync  
- New bedtime reminders with customizable advance notice  
- Enhanced HealthKit integration with more accurate sleep data reading

### 1.2 — 2020-08-28

- Add Steampunk Style Clock

### 1.1 — 2020-08-23

-Modified the color performance in dark mode
-You can select the statistical interval
-bugfix

### 1.0 — 2020-08-18

No release notes.

## Apps similar to R90 sleep assistant

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [BedX: Sleep Reminder & Cycles](https://appshunter.io/ios/app/bedx-sleep-reminder-and-cycles/id6746111782) | 5.0 (2) | Free | Health & Fitness |
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| [Sleep Tracker: Snore Monitor](https://appshunter.io/ios/app/sleep-tracker-snore-monitor/id6760831599) | — | Free | Health & Fitness |
| [Floii-Your Cycle-Savvy Bestie](https://appshunter.io/ios/app/floii-your-cycle-savvy-bestie/id6754274068) | — | Free | Health & Fitness |

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All apps by 阳 孙: https://appshunter.io/developer/1518808403

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*