Sleep is a fundamental biological and psychological process essential for cognitive functioning, emotional regulation, and physical health. Sleep disturbances are associated with a wide range of psychological difficulties, including anxiety, depression, impaired attention, reduced self-regulation, and poorer decision-making.
Contemporary research distinguishes several aspects of sleep functioning: sleep quality, insomnia symptoms, daytime consequences, sleep-related cognition, behavioral habits, circadian rhythms, and longitudinal sleep patterns. These dimensions reflect both physiological processes and psychological factors such as stress, worry, arousal, and daily routines.
These measures assess perceived sleep quality and general sleep disturbance as multidimensional constructs. They provide a broad overview of sleep functioning, including sleep duration, continuity, subjective restfulness, and sleep-related difficulties.
The Pittsburgh Sleep Quality Index (PSQI) is one of the most widely used measures of subjective sleep quality, assessing components such as sleep duration, sleep latency, sleep disturbances, sleep efficiency, medication use, and daytime dysfunction. ©
The PROMIS Sleep Disturbance assess perceived sleep quality, sleep depth, sleep restoration, and sleep-related difficulties within a modern patient-reported outcome framework.
These measures assess clinically relevant sleep difficulties, including problems falling asleep, staying asleep, waking too early, non-restorative sleep, and distress related to nightmares. They focus on symptom severity and the subjective burden of disturbed sleep.
The Insomnia Severity Index (ISI) assesses the severity and impact of insomnia symptoms, including distress and interference with daily functioning.
The Athens Insomnia Scale (AIS) provides an alternative measure aligned with diagnostic criteria for insomnia.
The Sleep Condition Indicator (SCI) assesses insomnia symptoms based on DSM-5 criteria, including nighttime difficulties, daytime impact, and symptom duration.
The Regensburg Insomnia Scale (RIS) assesses cognitive and emotional aspects of insomnia, including sleep-related worry and preoccupation.
The Bergen Insomnia Scale (BIS) assesses insomnia symptoms according to diagnostic criteria, including sleep onset, sleep maintenance, early awakening, non-restorative sleep, daytime impairment, and dissatisfaction with sleep.
The Spiegel Sleep Questionnaire assesses subjective sleep quality over the previous night.
The Nightmare Distress Questionnaire (NDQ) assesses distress and concerns related to nightmares, including their impact on sleep quality and daytime functioning.
The Nightmare Severity Index (NSI) assesses nightmare frequency, intensity, distress, and related sleep disruption.
These measures assess the daytime consequences of insufficient, disrupted, or poor-quality sleep. They focus on sleepiness, reduced alertness, impaired functioning, and the extent to which sleep problems affect everyday activity.
The Epworth Sleepiness Scale (ESS) assesses the tendency to fall asleep in everyday situations, providing an index of excessive daytime sleepiness.
The PROMIS Sleep-Related Impairment assess perceived alertness, sleepiness, tiredness, and functional impairment during waking hours.
These measures assess cognitive and emotional processes that contribute to sleep disturbance, especially insomnia. They focus on pre-sleep thoughts, dysfunctional beliefs about sleep, worry, cognitive arousal, and physiological activation before sleep; these processes are central targets in cognitive-behavioral approaches to insomnia.
The Glasgow Content of Thoughts Inventory (GCTI) assesses pre-sleep cognitive activity, such as rumination and worry.
The Dysfunctional Beliefs and Attitudes about Sleep Scale (DBAS) assesses maladaptive beliefs about sleep, including unrealistic expectations, catastrophic interpretations of sleep difficulties, and perceived consequences of poor sleep.
The Pre-Sleep Arousal Scale (PSAS) assesses cognitive and somatic arousal before sleep, including racing thoughts, worry, muscle tension, and physiological activation.
These measures assess habits, routines, and repeated observations that help describe sleep patterns over time. They focus on behaviors that promote or disrupt sleep, sleep-related routines, and day-to-day variability in sleep timing and quality.
The Sleep Hygiene Index assesses behaviors that may interfere with sleep, such as irregular schedules, stimulating activities before bedtime, and poor sleep environment practices.
The Sleep-Related Behaviours Questionnaire (SRBQ) assesses behavioral patterns associated with sleep problems.
The Consensus Sleep Diary provides a standardized method for recording sleep timing, awakenings, perceived sleep quality, naps, and related daily sleep information. It was developed through expert consensus to support consistent prospective sleep monitoring.
These measures assess circadian preferences and individual differences in sleep-wake timing. They focus on morningness-eveningness, preferred timing of activity and rest, and the alignment or mismatch between biological rhythms and daily schedules.
The Morningness-Eveningness Questionnaire (MEQ) assesses chronotype – individual differences in preferred timing of sleep and activity.
The Composite Morningness Questionnaire provides a shorter measure of morningness-eveningness.
The Munich ChronoType Questionnaire (MCTQ) assesses sleep timing on workdays and free days, allowing estimation of chronotype and social jetlag.
⇒ Anxiety. Sleep difficulties overlap with anxiety through pre-sleep worry, physiological arousal, threat anticipation, and difficulty disengaging from intrusive thoughts.
⇒ Depression often overlaps with sleep disturbance through insomnia, hypersomnia, early-morning awakening, fatigue, and reduced daytime functioning.
Sleep functioning is multidimensional and should not be reduced to a single score. Assessment may involve perceived sleep quality, insomnia symptoms, nightmare-related distress, daytime impairment, sleep-related cognition and arousal, behavioral habits, sleep diaries, circadian timing, and, when needed, objective or device-based indicators.
Interpretation should consider both sleep symptoms and maintaining factors: stress, worry, arousal, routines, irregular schedules, circadian mismatch, medical conditions, medication, substance use, and comorbid psychological difficulties.
Self-report measures are useful for screening and monitoring subjective sleep problems, but they do not replace clinical sleep assessment when symptoms are severe, persistent, medically complex, or suggest sleep apnea, parasomnias, narcolepsy, or other sleep disorders requiring specialized evaluation.