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.
McIntyre IM, Johns M, Norman TR, Armstrong SM.McIntyre IM, et al. Among authors: norman tr.Sleep. 1990 Jun;13(3):272-5. doi: 10.1093/sleep/13.3.272.Sleep. 1990.PMID: 2356399
McIntyre IM, Norman TR, Burrows GD, Armstrong SM.McIntyre IM, et al. Among authors: norman tr.Psychoneuroendocrinology. 1989;14(3):187-93. doi: 10.1016/0306-4530(89)90016-4.Psychoneuroendocrinology. 1989.PMID: 2756073