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

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

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

Count the number of triangles in the picture below:

Find the number of squares in the below picture

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

You see me once in June, twice in November, and not at all in May. What am I?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Find the next number in the series below

21 32 54 87 131 ?