@misc{indiciae091287e1ee2d,
  title = {Does our DNA determine when we sleep?},
  author = {C M Singer and A J Lewy},
  year = {1999},
  doi = {10.1038/12413},
  url = {https://pubmed.ncbi.nlm.nih.gov/10470065/},
  note = {Source identifier: 10470065}
}