Answer:
Forward I am heavy backward I am not. What am I?
What comes once in a minute twice in a moment but never in a thousand years?
The faster you run, the harder it is to catch me. What am I?
I'm simple for a few people, but hard for them to hear. I live inside of secrets and bring people's worst fears. What am I?
I sleep when you are awake, I am awake when you fall asleep. I can fly but no feathers to aid my flight. What am I?
Give it food and it will live, give it water and it will die.