@misc{indiciaeb7f9b396c2f0,
  title = {Psychological differences between long and short sleepers.},
  author = {E Hartmann and F Baekeland and G R Zwilling},
  year = {1972},
  doi = {10.1001/archpsyc.1972.01750230073014},
  url = {https://pubmed.ncbi.nlm.nih.gov/5019885/},
  note = {Source identifier: 5019885}
}