Laptop Feature?

[xNemesis]

I have a new Gateway Laptop okay. One night I left the house and forgot to turn of my laptop. I came back and saw that it was shut off. I thought nothing of it, like maybe I did shut it off and I don't remember, but i pushed the power button and noticed that under my acct name it said 2 Programs Running

Here's the question.
Is there some kind of feature where after a certain amount of time, your laptop will turn off to prevent from over heating but still be logged in?
Will it be okay for me to leave my computer on overnight now without worrying of it overheating?

Is this normal for laptops?


Thanks guys.