What do cats dream about?
Maybe their daytime activities; their favorite toys, catching a tasty mouse, or chasing their tails (like some men?)
Just like us, cats use their time in sleep to relive the events of wakefulness so that the brain can process and organize the information. This is why young kittens may dream up to 80% of the time compared to 30% for adult cats.
Their young brains have so much new information to interpret that the additional dreaming time is necessary for them to make sense of it all.