For all those who would like to know more:
Here you will find selected studies that have investigated the potential benefits of the substances used or simply explain the topic of sleep and stress in more detail:
Sleep:
Kalmbach DA, Anderson JR, Drake CL. The impact of stress on sleep: Pathogenic sleep reactivity as a vulnerability to insomnia and circadian disorders. J Sleep Res. 2018 Dec;27(6):e12710. doi: 10.1111/jsr.12710. epub 2018 May 24. PMID: 29797753; PMCID: PMC7045300.
Gottesmann C. GABA mechanisms and sleep. Neuroscience. 2002;111(2):231-9. doi: 10.1016/s0306-4522(02)00034-9. PMID: 11983310.
GABA:
Kim S, Jo K, Hong KB, Han SH, Suh HJ. GABA and l-theanine mixture decreases sleep latency and improves NREM sleep. Pharm Biol. 2019;57(1):65-73. doi:10.1080/13880209.2018.1557698.
Yamatsu A, Yamashita Y, Maru I, Yang J, Tatsuzaki J, Kim M. The Improvement of Sleep by Oral Intake of GABA and Apocynum venetum Leaf Extract. J Nutr Sci Vitaminol (Tokyo). 2015;61(2):182-7. doi: 10.3177/jnsv.61.182. PMID: 26052150.
Melatonin:
Xie Z, Chen F, Li WA, Geng X, Li C, Meng X, Feng Y, Liu W, Yu F. A review of sleep disorders and melatonin. Neurol Res. 2017 Jun;39(6):559-565. doi: 10.1080/01616412.2017.1315864. epub 2017 May 1. PMID: 28460563.
Zisapel N. New perspectives on the role of melatonin in human sleep, circadian rhythms and their regulation. Br J Pharmacol. 2018 Aug;175(16):3190-3199. doi: 10.1111/bph.14116. epub 2018 Jan 15. PMID: 29318587; PMCID: PMC6057895.
Phosphatidylserine:
Hellhammer J, Fries E, Buss C, Engert V, Tuch A, Rutenberg D, Hellhammer D. Effects of soy lecithin phosphatidic acid and phosphatidylserine complex (PAS) on the endocrine and psychological responses to mental stress. Stress. 2004 Jun;7(2):119-26. doi: 10.1080/10253890410001728379. PMID: 15512856.
Magnesium:
Cao Y, Zhen S, Taylor AW, Appleton S, Atlantis E, Shi Z. Magnesium Intake and Sleep Disorder Symptoms: Findings from the Jiangsu Nutrition Study of Chinese Adults at Five-Year Follow-Up. Nutrients. 2018;10(10):1354. Published 2018 Sep 21. doi:10.3390/nu10101354
Abbasi B, Kimiagar M, Sadeghniiat K, Shirazi MM, Hedayati M, Rashidkhani B. The effect of magnesium supplementation on primary insomnia in elderly: A double-blind placebo-controlled clinical trial. J Res Med Sci. 2012;17(12):1161-1169.
Ashwaganda:
Kelgane SB, Salve J, Sampara P, Debnath K. Efficacy and Tolerability of Ashwagandha Root Extract in the Elderly for Improvement of General Well-being and Sleep: A Prospective, Randomized, Double-blind, Placebo-controlled Study. Cureus. 2020;12(2):e7083. Published 2020 Feb 23. doi:10.7759/cureus.7083