You ask “But how can I be confident that… it’s the same conscious experience?”
So, how do you feel about going to sleep at night? Because the “you” that goes to sleep is definitely not the same as the “you” who wakes up in the morning. For example, the brain creates long-term memories during sleep. Conversely, you can’t “remain the same person” by refusing to sleep; that instead transforms you into a different person who has unpleasant hallucinations.
In short—the constancy of identity is unattainable. The most we can hope for is the continuity of identity. And even that is denied to us for eight hours a night.
You ask “But how can I be confident that… it’s the same conscious experience?”
So, how do you feel about going to sleep at night? Because the “you” that goes to sleep is definitely not the same as the “you” who wakes up in the morning. For example, the brain creates long-term memories during sleep. Conversely, you can’t “remain the same person” by refusing to sleep; that instead transforms you into a different person who has unpleasant hallucinations.
In short—the constancy of identity is unattainable. The most we can hope for is the continuity of identity. And even that is denied to us for eight hours a night.