Questionnaires

BAI

Cutoff > 7

BDI

Curoff > 9

Also 0–13: minimal depression; 14–19: mild depression; 20–28: moderate depression; and 29–63: severe depression

Epworth

Cutoff > 9
Wikipedia

PSQI

Cutoff > 5
PSQI.doc

Original paper, with scoring at end
Buysse 1989 - PSQI scoring.pdf