During which month do people sleep the least?

Be active and find the killer in the picture Riddle below.

Can you count the number of blocks in the picture below?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Can you Find and name the hidden bird in the picture below ?

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

With the help clues provided in the image, can you find the 5 digit key?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?