During which month do people sleep the least?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Which flower has two lips?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

If an electric train is travelling south, then which way is the smoke going?