There is NO research about cortisol measurements in sleep - trained infants, or whether this causes any damage. (ecochildsplay.com)
(Middlemiss told me that she once took cortisol measurements of babies while they were at home, and that their cortisol levels were lower than the babies tested in the sleep lab, but she didn't include this information in her study.) (expectingscience.com)
Using cortisol measurements, researchers have shown that when shelter dogs interact with humans, their stress levels also decrease (19). (wileypup.com)