BISQ-R SF: The BISQ-R SF (short form) includes the 19 scored questions and one additional sleep duration question.

[1] https://www.babysleep.com/wp-content/uploads/2020/03/BISQ-R-short-Mar-2020-final-1.pdf
[2] https://www.babysleep.com/wp-content/uploads/2020/06/BISQR-agreement-5_26_2020-1.pdf