For me i usually crush whatever boss i was stuck on if i put it down and come back to it later. Sometimes the attack patterns just have to stew in my brain to get absorbed.
Yeah, sleeping on it always helps me. I remember a study about monitoring rat brains after they had been trying to solve mazes all day, and their brains kept working on it during sleep. They performed better the next day too.
I'm fortunately not stuck anywhere at the moment. I just found this meme and 100% related.