What is the origin of the idiom "with one's eyes open" and when to use it?

The idiom "with one's eyes open" has its origins in the literal meaning of the words. It implies being fully aware, alert, and conscious while making a decision or taking an action. This expression is used to describe a situation in which someone is making a decision or taking a risk fully aware of the potential consequences and challenges. It signifies that the person is not acting blindly but is making an informed choice based on knowledge or awareness.