Light sensing protein present in 5000 of the 100000 i.e. 1 in 20 in the retinal neurons. Used to sense light and configure circadian clock, even in blind people.

This chemical is the reason why blind people can feel light and why you can see bright color outside even with your eyes closed.

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Ulysses contract

A Ulysses contract, also known as a commitment device, is a strategy that involves making a choice now that binds you to a future action, even if you might later regret that choice. It's inspired by the myth of Ulysses (Odysseus) tying himself to the mast of his ship to avoid the sirens' lure. This allows him to hear their song and avoid being shipwrecked