What does "awake" mean?
This is a power consumption thing. Most time when you're not using a smartphone it's in suspended state. I.e, as many as possible components are off and don't consume power. Awake means the CPU is in the running state. This usually means you're using it and the screen is also on.

Android devices also regularly wake up to check email, push notifications and so on even when thescreen is off. Also playing music or using navigation both with screen off forces the cpu to be awake.

Hence your finding: More awake -> more battery drain