There is already a user which is signed in, message when trying to log into your Sleepme account.
How to handle the Already a user signed in message when logging into your Sleepme account.
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Log into Account Message
If you see this message when trying to log into your Sleepme account then there is cached information on your app that won't allow you to log in. To resolve this issue you'll need to delete your app and reinstall it, this should remove the corrupted information.