I can’t think of a more terrible way to fall asleep.
A loading screen is psychologically linked to anticipatory arousal and goal-oriented expectancy, which activates the sympathetic nervous system. That is the opposite of what sleep requires, which depends on parasympathetic dominance and cognitive disengagement. Using a "loader" for falling asleep primes vigilance and temporal monitoring instead of relaxation, making it conceptually misaligned with sleep onset mechanisms.
Just my 2 cents.
It does not replace healthy bedtime routines of course, and it never meant to be a serious sleeping aid, but more of an experiment - and partially a joke. Maybe the premise should have been to help stop a spinning mind rather than to fall asleep...