What does this rebus puzzle means ?

How can a man go eight days without sleep?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

Keyboard words are not in alphabetical order, Why?

What begins with T, ends with T, and has T in it?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?