How can a man go eight days without sleep?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

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

What is black when you buy it, red when you use it, and gray when you throw it away?

What is the longest word in the dictionary?

I look at you, you look at me I raise my right, you raise your left. What am I?

What do you see in the given picture?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

Count the number of squares in the picture below.

Why is the Hole below a Lock?