MOS Sleep Problems Index
What It Measures
The MOS Sleep Scale asks about sleep across a whole month rather than a single night, and covers more than whether a person is sleeping enough. Twelve questions span six areas: trouble falling or staying asleep, snoring, waking short of breath or with a headache, how many hours a person sleeps, whether that sleep leaves them restored, and how sleepy they are during the day.
The Sleep Problems Index is what pulls those threads into a single number. Two versions exist: a six-item index and a nine-item index, both drawing on the disturbance, adequacy, somnolence, and respiratory items while leaving out sleep quantity. Both are scored 0 to 100, where higher means more sleep problems.
Additional Notes
Licensing Notes: Available for noncommercial use; permission is required to reproduce or reuse them commercially.
Learn More: Sleep Problems Index I uses 6 items; Index II uses 9. Both exclude sleep quantity, which is reported separately as hours per night — or dichotomized as optimal (7–9 hours) versus non-optimal. Most clinical trials report Index II.
