What word is represented by this rebus?

Identify the hidden meaning behind this picture?

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

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

What is so fragile that saying its name breaks it?

Can you count the number of triangles in the picture below?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?