Introduction
There is a variety of scales measuring the quality of sleep. The SQS is one of them (Yi et al., 2006). It correlates well with the Pittsburgh Sleep Quality Index (PSQI).
Run the demo
Legal stuff
It seems that the SQS can be used for research, but you need to acknowledge the authors and their research paper when writing about it (Yi et al., 2006).
Technically
This is a simple scale question with some reverse coded items.
The survey code for PsyToolkit
Copy and paste this code to your PsyToolkit account if you want to use the scale in your own online research project
References
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Yi, H., Shin, K., & Shin, C. Development of the Sleep Quality Scale. Journal of Sleep Research, 15, 309-316. Free/Open Access article.