Crunched on time

Question: There is a man who works on Big Bentley and he keeps the clock running smoothly. One day the clock stops all together, he muttered to himself "It's going to take me all day to fix it!" and he grumbles while he works because he doesn't want to have to change the time, but he finishes by tea and he doesn't have to change the clock by even a minute. How?

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: During what month do people sleep the least?

Question: When is 99 more than 100?

Question: What can be broken but never forgotten?

Question: Surrounded by life , yet life is its biggest enemy. But without life there is no need for it to exist. What is it?