An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Christian LM, Carroll JE, Porter K, Hall MH.Christian LM, et al.Sleep Health. 2019 Aug;5(4):327-334. doi: 10.1016/j.sleh.2019.03.005. Epub 2019 May 20.Sleep Health. 2019.PMID: 31122875Free PMC article.