reference
The National Health Interview Survey (NHIS), conducted by the Centers for Disease Control and Prevention (CDC), included a question about average nightly sleep duration in its 1977, 1985, and 1990 cycles, and added the question to the core questionnaire in 2004.
Authors
Sources
- Extent and Health Consequences of Chronic Sleep Loss and ... - NCBI www.ncbi.nlm.nih.gov via serper
Referenced by nodes (2)
- sleep duration concept
- Centers for Disease Control and Prevention entity