system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is happening when our eyes "glaze" over?
gpt
Check out Brain Games on Netflix, it has a lot of info on these types of things.

Your brain uses 30% of its energy processing vision. When your eyes gloss over, your brain has realized what you are looking at isn't needed information in conjunction with what you are thinking about and has reallocated some of that 30% energy to another thought process. Temporarily.