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Sources:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4427060/
http://onlinelibrary.wiley.com/doi/10.1113/jphysiol.1919.sp001842/abstract;jsessionid=6ED04155AEFA062025256829E4F456DA.f02t01
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https://www.ncbi.nlm.nih.gov/pubmed/6622880
https://www.researchgate.net/profile/Omer_Van_den_Bergh2/publication/26267253_Why_do_you_sigh_Sigh_rate_during_induced_stress_and_relief/links/568a22b708ae1975839cefa5.pdf
https://www.researchgate.net/profile/Karl_Teigen/publication/5661256_Is_a_sigh_just_a_sigh_Sighs_as_emotional_signals_and_responses_to_a_difficult_task/links/09e4150bf986989ab2000000.pdf
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https://www.psychologytoday.com/blog/brain-babble/201304/why-do-we-sigh
Why Do We Sigh?
A sigh is often taken to be a sign of sadness, but it can indicate a lot more than that—or a lot less.