@misc{indiciae8b766f64c20c,
  title = {Difficulty falling asleep.},
  author = {R C Gering and A R Mahrer},
  year = {1972},
  doi = {10.2466/pr0.1972.31.2.523},
  url = {https://pubmed.ncbi.nlm.nih.gov/5024931/},
  note = {Source identifier: 5024931}
}