If it's at 79% it means that it IS sleeping.
No, you shouldn't have to plug it in, unplug it and then let it sleep.
Sleeping is when you aren't using your phone and when it isn't running any tasks. For example, my screen could be off but I could be listening to music. Because the phone is still running it would cause my phone not to sleep.
If I used my phone for 5 minutes and then let the phone sleep (i.e. screen off and not doing anything) for 5 minutes, my awake time should then be 50%.
I'm willing to bet your problem was with an app (specifically shazam). When you check spare parts the blue bar on the name of the app it shows you which apps are being used on the phone the most. IF you have 100% awake issues, the blue bar will completely fill the app name (but make sure you've let your phone sleep).
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