Table 1 Diagnostic criteria of circadian rhythm sleep-wake disorders and insomnia

Measurement scale

1)

Progressive and day-by-day delay in bedtime/wake up time.(non-24-hour sleep-wake rhythm type)

yes/no; the range of daily delay

2)

Irregular sleep episodes at least three times during a 24-hour period.(irregular sleep-wake rhythm type)

yes/no; the duration of each sleep episodes and a total amount of sleep during a 24-hour period

3)

Presence of a stable advance (earlier timing) in bedtime/wake-up time relative to the general population and a difficulty staying awake until the desired bedtime or a difficulty remaining asleep until the desired time.(advanced sleep- wake phase type)

yes/no

4)

Presence of a stable delay (later time) in bedtime/wake up time relative to the timing required to maintain the schedule of social life and a difficulty falling asleep at the desired time or a difficulty waking up at the desired time.(delayed sleep-wake phase type)

yes/no

Measurement scale

5)

Difficulty falling asleep at night.

yes/no; less than once per week/ once or twice per week/ three or more per week^a

6)

Difficulty maintaining sleep at night.

7)

Waking up earlier than desired.

8)

Difficulty staying awake and/or dozing off during the day.

9)

Feeling of fatigue and/or difficulty in concentrating during day.

yes/no

10)

Presence of symptoms for at least three months.

yes/no