Hi y not,
I listened to some desana from a bhante. He often mentions that the arahants don’t really sleep and that they are mindful 24/7. They just recharge themselves in jhanas. This idea of arahants not being able to dream has been a suspicion at the back of my mind when I understand more about the Dhamma. I merely speculate it and never give it much thought until I listened to another desana from the same bhante. It is in this desana that he mentioned the arahants do not dream.