Table 2.

Examples of questionnaires to evaluate sleep quality pre- and postoperatively.

Questionnaires	Number of Items
Sleep diary [66,67]	Consensus Sleep Diary (CSD) suggest to include 9 themes.	Assessed themes: Time of getting into bed, time at which the individual attempts to fall asleep, sleep onset latency, number of awakenings, duration of awakenings, time of final awakening, final rise time, perceived sleep quality, additional space for open-ended comments.
Insomnia Severity Index (ISI) [89]	7 Items	Assesses the severity of sleep onset, sleep maintenance difficulties (both nocturnal and early morning awakening), satisfaction with current sleep pattern, interference with daily functioning, impairment attributed to the sleep problem, and concern caused by the sleep problem.
Pittsburgh Sleep Quality Index (PSQI) [90]	24 Items	Assesses sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbance, use of sleep medications, and daytime disturbance.
Mini-Sleep Questionnaire (MSQ) [91,92]	10 Items	Assesses both symptoms of insomnia and excessive daytime sleepiness
Sleep Condition Indicator (SCI) [93]	8 Items	Assesses concerns about sleep quality, getting to sleep, remaining asleep, daytime functioning, daytime performance, duration of sleep problem, nights per week having a sleep problem, and extent troubled by poor sleep.
Epworth Sleepiness Scale (ESS) [94]	8 Items	Assesses the severity of daytime sleepiness, which is an important manifestation of sleep disorders.
The Richards-Campbell Sleep Questionnaire (RCSQ) [95]	6 Items	Assesses in-hospital sleep quality: sleep depth, sleep latency, awakenings, returning to sleep, sleep quality, and noise disturbance.