Nothing like a good existential crisis at 3AM! The Boltzmann Brain paradox suggests that according to thermodynamic principles, it's statistically more likely for a fully-formed, self-aware brain to randomly pop into existence from quantum fluctuations than for our entire ordered universe to exist.
So that brain asking if you're trying to sleep? It might be a cosmic fluke that materialized from random particles—and worse, you might be one too! Just a disembodied consciousness floating in the void with false memories of a universe that never existed.
Sweet dreams! (If dreams even exist...)