Night Feeds

Hello Ladies - hope you can give me your thoughts. So by now, our babies are 4-5 months old and many of us must be enjoying the fact that babies have started sleeping through the night. When your little one has slept for 7-9hrs and let’s say they had slightly less milk the previous day, do you wake them at night to feed? I read in one of the books that we should let them sleep for a minimum of 8hrs and not interfere as it impacts their circadian rhythm. What are your thoughts? At which point do you wake them at night to feed, if at all?