Skip to main content

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

From: Prevalence and associated factors of circadian rhythm sleep-wake disorders and insomnia among visually impaired Japanese individuals

Criteria of circadian rhythm sleep-wake disorders 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
Criteria of insomnia Measurement scale
5) Difficulty falling asleep at night. yes/no; less than once per week/ once or twice per week/ three or more per weeka
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
  1. aThese items correspond to the criteria 5-8