Answer:
I may seem real but it always turns out I was never there in the first place... you only see me during a certain resting stage.
Without me everyone would lose their head.
I am pronounced as one letter, written with three. I come in blue, black, brown, or grey. Reverse me and I read the same either way. What am I?
I beam, I shine, I sparkle white. I'll brighten the day with a single light. I'll charm and enchant all. I'll bring the best in you all. What am I?
There is one in every corner and two in every room.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?