Brain Part That Regulates Sleep and Consciousness
Puzzle 3 of Tour the Body Pack
Question is: Brain Part That Regulates Sleep and Consciousness
and the answer is: THALAMUS
Word Meaning:
THALAMUS — (neuroanatomy) Either of two large, ovoid structures of grey matter within the forebrain that relay sensory impulses to the cerebral cortex.
Definitions from Wiktionary.