In the Funding statement, the grant number from the funder Fundamental Research Funds for the Central Universities is listed incorrectly. The correct grant number is: SWU118004.

The ISI score values in Table 1 are incorrect. The authors have provided a corrected version here.

Table 1

Participant characteristics and sleep measures.

	Young (n = 43)	Old (n = 37)	p-value
Gender (female/male)	21/22	20/17	0.64a
ESS (mean±SD)	7.23±3.01	8.65±4.8	0.11b
ISI (mean±SD)	10.5±2.13	9±1.53	0.0014b
KSQ sleep quality index (mean±SD)	5.26±0.43	5.19±0.48	0.52b
KSQ snoring symtom index (mean±SD)	5.88±0.32	5.65±0.54	0.02b

^aChi-square test

^bTwo-tailed two sample t-test

Bold p-values indicates significant difference in sleep measures between young group and old group. SD, standard deviation; ESS, Epworth Sleepiness Scale; ISI, Insomnia Severity Index; KSQ, Karolinska Sleep Questionnaire.