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.
Hackney JE, Weaver TE, Pack AI.Hackney JE, et al.Sleep Med Rev. 2008 Apr;12(2):143-51. doi: 10.1016/j.smrv.2007.07.002. Epub 2008 Jan 25.Sleep Med Rev. 2008.PMID: 18222098Review.