What does this rebus puzzle means ?

Why do people go to bed?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

What is the next number in the series?

15 29 56 108 208 ?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

Find the number of squares in the below-given picture.

Replace the question mark with the correct number in below Picture:

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

If eleven plus two equals one, what does nine plus five equal?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E