Steps to exclude subjects of ID or GSC suffering from other sleep disorders are as follows. First, the doctor will ask the subject in person if he/she has obstructive sleep apnea syndrome, restless legs syndrome, and other diseases, while the subject will fill out scales such as BDI, BAI, ESS, Mini‐Mental State Examination (MMSE), and Montreal Cognitive Assessment (MoCA). Subjects who score within the normal range on these scales will be allowed to join the group.
