TY  - RPRT
TI  - Difficulty falling asleep.
AU  - R C Gering
AU  - A R Mahrer
PY  - 1972
DO  - 10.2466/pr0.1972.31.2.523
UR  - https://pubmed.ncbi.nlm.nih.gov/5024931/
ID  - 5024931
ER  -