Pittsburgh Sleep Quality Index

The Pittsburgh Sleep Quality Index is the sleep measure supplement trials report. When an evidence page on this site says melatonin or magnesium moved sleep quality, the points it moved were almost always PSQI points.

Every question is about the past month, not about last night. Eighteen scored answers fold into seven component scores of 0 to 3 each, and the global score is their sum: 0 to 21, where a higher number is worse sleep.

Above 5 is the published cut-off for a poor sleeper. It is a screening threshold from the 1989 paper, not a diagnosis, and it is also the reason most sleep trials only enrol people scoring 6 or more.

The questions are not reproduced on this page. The University of Pittsburgh owns the PSQI and allows a free reprint only for non-commercial research and education, and this is a commercial site. Get the PSQI from University of Pittsburgh, Center for Sleep and Circadian Science.