There are different kinds of TBI that cause different brain dysfunctions. Research suggests that TBI results in damage to sleep-regulation centers including the reticular activation system, specifically damage to the suprachiasmatic nuclei (SCN) which leads to disturbances in the circadian rhythm. Considering hypersomnia, mostly areas involving the maintenance of wakefulness are damaged, such as the rostral pons, caudal midbrain and thalamus.
