What is the word or phrase?

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

You can see it everyday, But cannot touch it at will. What is it?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

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

Whats the next number in the below number sequence pattern.

These types of puzzles are known as charades. What you have to do is find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be office.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.