Riddles about man

How can a man go eight days without sleep?

At the sound of me, men may dream or stamp their feet. At the sound of me, women may laugh or sometimes weep.

I am a 5 letter word. Take away the first letter and I am a country's name. Take away the first two letters and I become the opposite of the 5 letter word. Who am I?

Four men were fishing in a boat on the lake. The boat turned over and all four men sank to the bottom of the lake. And yet, not one single man got wet. How is this possible?