IPhone Notification Mystery?

I have the iPhone 4s and quite a few apps. However, my phone keeps making a noise as if I'm getting a notification about something. However, I have no clue where this noise is coming from or what app it's notifying me about. Any advice on how I can figure it out?

You have textaphrenia: where you think you got a text or notification even though you didn't. (DO NOT TRUST THIS ANSWER.)

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