I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?

John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

It belongs to you, but other people use it more than you do. What is it?

Solve the following series:
AZ, GT, MN, __, YB

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

What is the next number in this series?

4,12,84,3612....

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?