To resolve the issue of the Waking Up app failing to open with a swirling circle, follow these steps:

1. Force Close the App:
- On your device, locate the Waking Up app and swipe it away or use your task manager to force close it.

2. Restart Your Device:
- Power off your device completely, wait for a minute, then turn it back on. This often clears temporary glitches.

3. Clear App Cache (if applicable):
- Depending on your platform (iOS/Android), go to your device settings, navigate to the apps, find the Waking Up app, and select clear cache or temporary data. This can help to rectify any stored data issues.

4. Reinstall the App:
- Uninstall the Waking Up app completely. Then go to the App Store (iOS) or Google Play Store (Android) and reinstall the app. This can resolve corrupted installation issues - learn more.

5. Check for Updates:
- Ensure that both your device's operating system and the Waking Up app are up to date. Go to the App Store or Google Play Store and check if there's an update available for the app.

6. Check Network Connection:
- Make sure you have a stable internet connection. Sometimes, the app may require online access to load properly.

7. Contact Support:
- If the problem persists after trying all the above steps, it may be beneficial to visit the Waking Up app support page for further assistance or report the issue - learn more.

Following these steps should significantly help to resolve the swirling circle issue when attempting to open the Waking Up app.