@misc{indiciae5ca7b63f6199,
  title = {REM sleep, naps, and depression.},
  author = {D J Kupfer and J C Gillin and P A Coble and D G Spiker and D Shaw and B Holzer},
  year = {1981},
  doi = {10.1016/0165-1781(81)90049-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/6945614/},
  note = {Source identifier: 6945614}
}