You must counteract it with some kind of special move
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you cant you have to find a Pokemon like hypno ,or a butterfree has sleep powder
Sabrina is the toughest gym leader. The best way to fight her strong psychic pokemon is to use a pokemon than can take special hits and attack back with powerful physical attacks. Snorlax, Slobro, Hypno, Gyarados, and Lapras are all good options. Sabrina's pokemon are very fast, so it is crucial that you paralyze them. You should always have sleep powder or thunder wave on your team. If you can put her pokemon to sleep, or freeze them, you will win.
There are no items that can put Pokemon to sleep, only moves like hypnosis and sleep powder.
yawn
snorlax