what does the below math rebus puzzle mean?

Why do people go to bed?

The more you take me, the more you leave me behind.
Who Am I?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

Jigsaw captured 100 people and make them stand in a circle and all these people are labelled as Person1, Person2, Person3... Person100. He made them play a crazy game in which Person 1 shot Person 2 and pass the gun to the next person and so on until one stands alive.

Which person will survive in the end?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

On a charity event in Russia, Murray beat Djokovic by winning six games and losing three games.
Note: There is a total of 5 service breaks(one who serve lost the game).
Who served first, Djokovic or Murray?