From Longman Dictionary of Contemporary Englishhave eyes in the back of your headhave eyes in the back of your headNOTICEto know what is happening all around you, even when this seems impossible We’ll have to be really careful – old Jonesey has eyes in the back of his head. → eye
Examples from the Corpus
have eyes in the back of your head• When you're looking after a two year old, you need to have eyes in the back of your head.• You need to have eyes in the back of your head to be a teacher. 