Forty healthy subjects were also enrolled in the GSC group. The inclusion criteria were as follows: (1) Aged 18–65 years, (2) right‐handed, (3) no symptoms or history of psychiatric disorders and sleep disorders, (4) a total score <5 on the PSQI at screening and a total score <8 on the ISI at screening, and (5) not taking any psychotropic medications or hypnotics during their lifetime.
