Sleep quality

Sleep quality is a person's overall sense of how well they slept, reflecting depth, continuity, restfulness and how refreshed they feel on waking.

It is distinct from sleep quantity: someone can spend enough hours in bed yet report poor quality because sleep was fragmented or shallow. Researchers capture it with questionnaires, most commonly the Pittsburgh Sleep Quality Index, which combines ratings of latency, duration, efficiency, disturbances, medication use and daytime function into a single score. Objective measures such as sleep efficiency and time in deep sleep relate to quality but do not fully explain it.

Poor sleep quality is common in insomnia, chronic pain, depression, menopause and shift work, and it is assessed through the person's report, a sleep diary and, where needed, an overnight study. Cannabinoids have been studied for sleep quality in several small trials and observational studies, and reviews describe the evidence as limited and inconsistent.