You need your sleep for your COGNITIVE
processing to perform at optimum levels.
The Big Bang Theory Season 2, Episode 6
and build his COGNITIVE life
back up on firm principles.
The Big Bang Theory Season 12, Episode 10
Impaired COGNITIVE function.
The Big Bang Theory Season 3, Episode 14
...which is required for COGNITIVE
reasoning, including scientific inquiry...
The Big Bang Theory Season 4, Episode 3