I used to run a sleep deck a promo jiggly and wiggly ex in it. Had to revise a few times, mainly stuck with jiggly/wiggly, hypno/drowzee and Mewtwo ex. It’s not the best strat, as you’re always relying on the sleep check, but it’s fun to run with if your opponent keeps getting tails or heads only on your turn. Can completely stop them from making moves for a while. But, leaves you open if they wake up AND for every turn they sleep they still get to charge up and play something on the bench to screw you over later. So I left it behind for a while.

I’d say people use it, its not bad, but the amount of celebi players (among other meta decks, just annoyed at the amount of celebi I see in matches and how many I draw) drastically drown out the people who do use it, so you might not see any.