Andrew Huberman· PhD
So if you're pre-adrenopausal where your adrenal glands are still working fairly well, usually still have a decent amount of progesterone around, and this can be measured too. So after menopause, women make progesterone from their ovaries, or sorry, from their adrenal glands. If that progesterone crosses the blood-brain barrier, especially if it's 5-alpha and 3-alpha reduced, so it's modified a little bit, then it is both a GABA agonist, which helps sleep just like GABA does, gamma-amino butyric acid, the main inhibitory neurotransmitter of which lots of things work on, alcohol works on GABA as well.