try ganzfeld effect it may help you with lucid dreaming. listen to binaural beats and try to control your dreams.

you are like a cat but it's not normal for your life as you won't be able to go forward if you are too sleepy. it causes laziness.

You mean LG G4. I hope you rebooted it. if the problem persist headphones button might be the reason.

sometimes it happens because of human is afraid of darkness but if it's not so it may be a creature from another world.

I think that it happens to every person. Maybe it was a lucid dream that is quite similar to reality.

Yes it's normal)