💤 SleepSync

A mobile application that helps users determine the optimal time to go to sleep based on a desired wake-up time, personalized sleep duration, and a wind-down buffer.

Features

• Wake-up Time Selection: Choose your desired wake-up time with an intuitive time picker
• Sleep Duration Customization: Select how much sleep you need (6-10 hours) via an interactive slider
• Wind-down Period: Set a buffer time before sleep (15/30/45/60 minutes) to help you prepare for rest
• Dynamic Sleep Suggestions: Get personalized bedtime recommendations based on your preferences
• Preference Saving: Your settings are remembered between app sessions using AsyncStorage
• Multiple Screens: Navigate between Home, Sleep Calculator, History, and Settings screens
• Theme Support: Interface adapts to light/dark mode preferences

Technical Stack

• Framework: React Native with TypeScript
• Target Platforms: iOS and Android
• Navigation: React Navigation with bottom tabs and stack navigator
• UI Components:
  • @react-native-community/datetimepicker – Wake time selection
  • @react-native-community/slider – Sleep duration adjustment
  • react-native-vector-icons – Interface icons
• Storage: @react-native-async-storage/async-storage for persisting user preferences and sleep history

Project Structure

• src/components/: Reusable UI components (TimePicker, WindDownSelector, ResultCard)
• src/screens/: Main application screens (Home, SleepCalculator, History, Settings)
• src/utils/: Utility functions for sleep calculations and data storage
• src/styles/: Theme definitions and styling constants
• src/types/: TypeScript type definitions
• src/navigation/: Navigation configuration

Getting Started

Note: Make sure you have completed the Set Up Your Environment guide before proceeding.

Step 1: Start Metro

First, you will need to run Metro, the JavaScript build tool for React Native.

To start the Metro dev server, run the following command from the root of your React Native project:

# Using npm
npm start

# OR using Yarn
yarn start

Step 2: Build and run your app

With Metro running, open a new terminal window/pane from the root of your React Native project, and use one of the following commands to build and run your Android or iOS app:

Android

# Using npm
npm run android

# OR using Yarn
yarn android

iOS

For iOS, remember to install CocoaPods dependencies (this only needs to be run on first clone or after updating native deps).

The first time you create a new project, run the Ruby bundler to install CocoaPods itself:

bundle install

Then, and every time you update your native dependencies, run:

bundle exec pod install

For more information, please visit CocoaPods Getting Started guide.

# Using npm
npm run ios

# OR using Yarn
yarn ios

If everything is set up correctly, you should see your new app running in the Android Emulator, iOS Simulator, or your connected device.

This is one way to run your app — you can also build it directly from Android Studio or Xcode.

Step 3: Modify your app

Now that you have successfully run the app, let's make changes!

Open App.tsx in your text editor of choice and make some changes. When you save, your app will automatically update and reflect these changes — this is powered by Fast Refresh.

When you want to forcefully reload, for example to reset the state of your app, you can perform a full reload:

• Android: Press the R key twice or select "Reload" from the Dev Menu, accessed via Ctrl + M (Windows/Linux) or Cmd ⌘ + M (macOS).
• iOS: Press R in iOS Simulator.

Congratulations! 🎉

You've successfully run and modified your React Native App. 🥳

Now what?

• If you want to add this new React Native code to an existing application, check out the Integration guide.
• If you're curious to learn more about React Native, check out the docs.

Troubleshooting

If you're having issues getting the above steps to work, see the Troubleshooting page.

Learn More

To learn more about React Native, take a look at the following resources:

• React Native Website - learn more about React Native.
• Getting Started - an overview of React Native and how setup your environment.
• Learn the Basics - a guided tour of the React Native basics.
• Blog - read the latest official React Native Blog posts.
• @facebook/react-native - the Open Source; GitHub repository for React Native.