I hated Vanilla Sky, and yet liked the concept. (I take it back. Tom Cruise talking with that mask was very memorable. The rest was garbage with horrible directing.)
It's similar to the Matrix, and like I said earlier, I certainly entertain the idea of a virtual reality, so real and possible, that we may already be in one which is the Simulation Theory. (That was a little too late for a spoiler alert, but it's old enough now to not care about that)
Diving in and out of dreams in general, some lucid, has left me perplexed by the definition of 'reality'.
And of course loss of ego (ego death), and self will which is another hot topic discussed at length in other threads.
As for your dreams mentioned just earlier about the perfect life, Lucide, those are fantasies, not dreams. Yes, we can do what we want in dreams, but how long would it take before you realize that you can do anything and question desire itself, and where it comes from and why it even exists in the first place?
I did say before that we should not hijack this thread with our shenanigans, but that was about the gossip of your true identities.
This is deep stuff.