ちなみに、論文はこう言ってる

炭酸水素イオン(bicarbonate)で睡眠の質が少し改善する

Association between serum bicarbonate and pH with depression, cognition and sleep quality in hemodialysis patients.
https://www.ncbi.nlm.nih.gov/pubmed/25894326

We found that, sleep quality but not cognitive function or depression was independently related with venous pH and bicarbonate.

つまり、重曹ですよ。体のpHと関係してるらしい