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I can possibly understand why the phone can be Awake without having the screen on (background stuff), but how can the screen be on without it being awake?

Battery usage screen-shot

If relevant my device is the Nexus 4 running Android Jelly Bean 4.3.

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This part of your screenshot you can find explained (partly) in my answer to What is Cell standby and how can I keep it from eating my battery?. But more specifically to your question, here's what it is about:

  • Network signal: Quality of the signal (colors are explained in this answer)
  • GPS on: Whether GPS was actively used
  • Awake: some app requested a Wakelock (see: How to deal with (orphaned) WakeLocks?). At least that's the best logical explanation to your question, though I cannot name a reference for that.
  • Screen on: the screen was turned on (either manually by the user, or automatically by an app). If the user turns the screen on, that doesn't necessarily mean a wake lock being aquired.
  • Charging: a charger was connected and supplied the device with energy

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