Answer:
I lose my head in the morning and regain back it at night.
Why did the computer keep sneezing?
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
I am an activity involving pins flying in the air.
What gets sharper the more you use it?
Give it food and it will live, give it water and it will die.