Don't sleep on 

A phrase used to describe a person who should not be underestimated. A practical term which can be used with most anyone in any situation where the individuals abilities, conduct or intelligence might be underestimated.

I know the Kobe and the Lakers have won nine games in a row, but Manu Ginobili is a Laker killer. Don't sleep on Manu Ginobili!

Don't sleep on by Tom_in_SA March 1, 2009

don’t sleep on it 

To make a decision early, before sleeping, therefore meaning it stays in your head.

Your idea is amazing, don’t sleep on it

don’t sleep on it by Cdog6921 November 27, 2017

dont sleep on my gang 

What you say when someone mess with your gang.

Yo nigga, your gang sucks!
DONT SLEEP ON MY GANG NIGGA.

dont sleep on my gang by Beneath May 19, 2017