Colorland's Party Riddle

Question: In Colorland, there was a party. Red tried out the hardest adventures and he was never scared for his color, red, symbolized courage. Orange looked at the sun with a smile for his color is the color of the sun in space. Yellow went on laughing for her color symbolizes happiness. Green went on in the fresh grass for grass is his color. All the colors were happy. However, Blue stared at the horizon, crying. Why he is not happy?

Question: What can be broken but never forgotten?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?

Question: Which thing that comes once in a year, twice in a week?

Question: You are trying to get your chicken, fox, and wheat to the barn. However, the barn is on the other side of the river. You are on a boat and can only transport one animal or wheat at a time. You must choose carefully not to leave the wrong two together, though. It's either the fox will eat the chicken or the chicken will eat the wheat. How do you take each thing across safely?

Question: During what month do people sleep the least?