Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

What does this rebus mean?

O
N
C
E
TIME

During which month do people sleep the least?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Role Action
Block Prevents the target player from acting
Redirect Change target player target.
Save Protects the target player from death.
Seer Sees all actions that occurred
Murderer Kills the target player

The following five players are playing:

Andy
Brian
Chris
Daniel
Fred

You are Andy the Seer and you saw the following things:
a) Brian was redirected to Chris.
b) Chris was blocked.
c) Daniel was killed.

Who is the murderer then?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

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.

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

What is the word or phrase below?
R | E | A | D

How many letters are in the alphabet?