@misc{indiciae91ba63d134de,
  title = {Do birds sleep in flight?},
  author = {Niels C Rattenborg},
  year = {2006},
  doi = {10.1007/s00114-006-0120-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/16688436/},
  note = {Source identifier: 16688436}
}