Why does my line drop low when I'm asleep?

Your energy line may be low when you’re asleep because you're not using as much energy as when you're awake.

Your energy line may be low when you’re asleep

That’s normal. You’re using less energy when you’re sleeping, but you’re never completely ‘turned off’ - you’re always in ‘standby’ mode. When your body needs to raise your energy level it will.