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

What you cannot hold but it is yours?

How could a baby fall out of a twenty-story building onto the ground and live?

How is a fly different from a mosquito?

Can you count the number of squares in the figure below?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

What's a single-digit number with no value?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?