Why do people go to bed?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

Which flower has two lips?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

Can you make four (4) nines (9) equal 100?

Why did Buffon take the goal with him after every Juventus match?

Who is that with a neck and no head, two arms and no hands? What is it?