This may not be very noticeable on testing, since memory is tested on discrete items, and creativity is not required in most of everyday life. But the effect is there, nonetheless.

Furthermore (and this is speculative), I suspect that insufficient sleep leads people to be somewhat disorientated in space and time, perhaps increasing alienation and disaffection. Somehow or another, at a mostly unconscious level, what goes on in our dreams is embedding us in the perceived world.

If you’re both in the 1% that function well on low sleep, and the 0.01% IQ range… this finding seems odd.