That is pretty surprising to me. I’ve only experienced that when waking up in the middle of a very vivid dream, and sometimes will see geometric shapes with my eyes closed for 10 or 20 seconds. Then it goes away. I chalked it up to the brain being flooded with weird chemicals during sleep. I’ve also seen this while on oxycodone after a surgery. Personally, I kinda envy you, you must live in a very exciting world if your brain is loaded with those chemicals all the time! Serotonin, maybe?