I think so. This is basically a link dump, though. Stimulant refers to adderall and other strong prescription-needed stimulant drugs, so not coffee or nicotine.
This is the usual glorious TLDR; from Scott Alexander. Steve Sailer picked it up and discussed it here, and if you even glance at the comments you’ll see a bunch of his readers use stimulants, previously used stimulants or are frothingly envious of people who have access to stimulants.
As to how this relates to American motherhood, since we’re closing in on 60% of births to women with a BA or higher, you have the largest historical group ever on an annual basis of women who came out of the hothouse high-performance, heavy-stimulant using college environments and decided to go for marriage and kids. So they are bringing in expectations of how to “be productive” that are influenced by heavy stimulant abuse, even if they didn’t mess with that stuff themselves or don’t know anyone who did.
It also explains some of the extraordinary cultural callousness around sleep deprivation, as well. It’s not just that being sleep deprived yourself makes you cold to other women experiencing it. It’s that the entire media culture is full of stimulant abusers who don’t think about the fact that nursing and pregnant women can’t possibly solve their sleep issues the way the stimulant users do.
The selection bias of women who come up in those high-performance environments but end up starting families anyway and trying to make it all work without those little helpers (and without cultural support to “trade across” with actual domestic support) is worth exploring, rather than continuing to assert that women are delaying marriage and childbearing to be scandalous cat ladies.