Have one's wits about one

He was confused, half elated, half disappointed, and had not his wits about him.

Luke alone seemed to have his wits about him. He saw that there was not a moment to lose, and, gathering up his strength, dashed to the old lady's assistance.

And if you think he won't have his wits about him, just you try to fool him on some deal, and see.

And so this woman from across the hills, a soft-spoken creature with her wits about her, and by name Oline, she stayed with them a couple of days, and had the little room to sleep in.