What is closed during the day, and open at night. But you can always use it.
A patio window
I come during winter, But leave during summer. You'll see me at night, And maybe during day, But one time you'll never see me, Is without heat in my bay.
I will make your day great But during the night I'll keep you up late. Away the darkness runs from me Just so that you may see. By nature and by man I am made. Call me and I'll come to your aid. Even though you may try so much You'll never touch. I am faster than a speeding train, Faster than any plane. So who may I be? You'll just have to guess and see.
