 ISI is a 7-item questionnaire in which participants rated their perceived severity of sleep disruption on a 5-point Likert Scale.


University of Georgia

Participants used a range of measures to assess their subjective sleep quality including Insomnia Severity Context (ISI), Pittsburgh Sleep Quality Index (PSQI), Epworth Sleepiness Scale (ESS), Fatigue Severity Scale (FSS), and Daily Sleep Log.

MBTI Outcome Measures: Subjective Sleep Quality

Peters, A., Reece, J., Meaklim, H., Junge, M., Cunnington, D., Ong, J., . . . Greenwood, K. (2021). Mindfulness and Behaviour Therapy for Insomnia: An Assessment of Treatment Effect in a Sleep Disorders Clinic Population with Insomnia. Behaviour Change, 38(1), 25-39. doi:10.1017/bec.2020.18


Mindfulness and Behavior Therapy for for Insomnia: An Assessment of Treatment Effect in a Sleep Disorders Clinic Population with Insomnia

Insomnia Severity Context (ISI)

PSQI is a 19-item self-rated questionnaire that assesses sleep quality over a one month time interval and generates scores on seven components ranging from 0 to 3. Higher scores ranging from (0-21) reflects poor sleep quality. 


Pittsburgh Sleep Quality Index (PSQI)

ESS is an 8-item questionnaire that is rated on a four point scale ranging from 0 to 3. This measures subjective daytime sleepiness in adults in a range of situations. It is a very popular measure for sleepiness.

Epworth Sleepiness Scale (ESS)

FSS is a 9-item questionnaire that is rated by participants on their level of agreement with statements regarding their levels of fatigue over the past week on a 7-point Likert scale.

Fatigue Severity Scale (FSS)

Daily Sleep Log was completed by participants upon awakening in the morning. This is used to record any sleep-wake pattern. Sleep parameters derived from the sleep logs include total sleep time (TST), sleep onset latency (SOL), wake after sleep onset (WASO), number of awakenings (NWAK), and sleep efficiency (SE).

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