Hypersomnia Severity Index

Hypersomnia Severity Index has no effect on cognitive function in humans.

“neither ESS nor HSI was associated with cognitive outcomes.”

Humansunadjusted analysesn = 461

Association between sleep inertia and cognitive performance among older adults in the Wisconsin Sleep Cohort study

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine·6 Jul 2026