> How do you know when you wake up in the morning that you are the same “I” as you remember from the previous day?

I don't know. That doesn't invalidate the questions, though:

- Why am I me at this instant and not someone else (Hellie's vertiginous question)

- Why should there be a first person perspective at all (Chalmers' hard problem of consciousness) [2]

[1] https://en.wikipedia.org/wiki/Vertiginous_question

[2] https://en.wikipedia.org/wiki/Hard_problem_of_consciousness