What Am I Riddles

Question: The more i am present, the less you can see me. Who am i?

Question: When you don't have enough of me, you feel a kind of gloom. But when you are using me, it is time that you consume. What am I?

Question: This is a fruit. You cross off the first letter it is a crime. Cross of the second letter its an animal. Cross off the next two letters it is a vowel. What is it?

Question: I am a teacher, yet I am not a human nor a robot.

Question: While you're asleep You are also Awake, While you are Awake you're also asleep. What is it?