Does Putin have sleepless nights?

It would be nice, if not encouraging, to imagine Vladimir Putin having really bad nights, unable to sleep because of the rising challenges to his dream of being the new Czar of Russia over a mighty empire. Did Stalin have sleepless nights? Did Hitler? Putin always gives the impression he is satisfied with himself. But there must be times when he worries whether he is going to be able to maintain control over his huge country. Of course he has the whole security apparatus to call on but eventually when the international sanctions start to affect every single family, even the rich, there will surely be a growing resentment about the war in Ukraine and Putin's role in it. This is Putin's war. No one else's. No one else can be blamed. And when that moment is reached, perhaps that self-satisfied smile on his face will be wiped off. I'm not saying it's going to happen soon but the Russian people will get wise to what is going on and will start to point the finger of anger at their leader. Too many sleepless nights worrying about his own future, that would be good for everyone, especially the poor Ukrainian people.