You are just sitting down you are sitting down playing your computer game then you go outside to go to the mall with your friends and you leave your computer game on. When you come you see that your computer has been sleeping all the time you had been at the mall your energy bill has raised and you are in distress. Never do that again your mom said but I forgot you say but it doesn't work. Your mom puts you in a class about saving energy and your allowance has decreased. You learned how not to leave your computer on while you are not using for periods of time. You are happy and you had fixed things by turning the computer off when you are not using it.