<em>Si no </em><em>puedes</em><em> dormir y el sueno deseas, lo vas a conseguir si </em><em>cuentas</em><em> ovejas.</em>
This means that if you want to sleep you need to relax your mind. In this way, if you start counting sheep in your mind there will be a point in which you will get to sleep. Is it a trick? Maybe! Because you are playing with your mind until it gets tired. Then you could sleep by counting sheep.