Plane Crash Riddle (Medium, all ages)

Question: A couple goes on a plane. The plane crashes. The crash is in all the newspapers, on all the news channels on radio and television, and everywhere for everything. You know why? Because every single person died. But the next day, that same couple are found walking on the street, happy as can be, not a scratch or bruise on them. How can that be? P.S.: For more fun, only read this once. Reading it more will give it away plainly, and you came here to have fun, right?

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?