During which month do people sleep the least?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Give it food and it will live; give it water and it will die.

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

I have an eye but still cannot see.

Who am I?

O_er_t_o_

Complete the missing letters of the given word.

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

What word begins and ends with an E, but has only one letter?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is the riddle which can be asked all day with a different correct answer each time.