@article{buysse1989,
  title={The Pittsburgh sleep quality index: A new instrument for psychiatric practice and research},
  author={Daniel J. Buysse and Charles F. Reynolds and T. H. Monk and Susan Berman and D J Kupfer},
  year={1989},
  journal={Psychiatry Research},
  doi={10.1016/0165-1781(89)90047-4},
  url={https://doi.org/10.1016/0165-1781(89)90047-4}
}