[johnisgood]

Keep in mind that taking higher doses of DPH has the opposite effects, i.e. you will definitely NOT sleep from it. See "anticholinergic toxicity". When I was younger I thought taking more of it is going to help me sleep better, but I ended up with auditory hallucinations, tachycardia, and the like. I was hospitalized for it, albeit left untreated, or rather, treated as a junkie and they threw me into a detox room, but that is a different issue.

[johnisgood]

I could not edit my comment, so here it is: I forgot to include a relevant symptom I had, which is delirium. I was in a delirious state for many hours, and it left me in a disassociated state for some time afterwards.

Just to add, most nootropics are cholinergics in some way or another. Take a look at choline supplements, or racetams (from Wikipedia: "Racetams are understood to work by activating glutamate receptors that are colocalized with cholinergic receptors, thus increasing the frequency of activation of the latter."). They are supposed to help people with Alzheimer's disease, improve their memory and whatnot. There are many studies around to support this. There is also Huperzine A that has been investigated as a possible treatment for Alzheimer's disease and there was a meta-analysis that found it efficacious in improving cognitive function (see https://en.wikipedia.org/wiki/Huperzine_A for more).

But yeah, anticholinergics are known to be bad for people with Alzheimer's disease, and some cholinergics are known to be effective in improving cognition of those who have it. Of course there are other medications that are supposed to be avoided, here is more about it for the curious (it mentions DPH, too): https://www.mind.uci.edu/medications-and-patients-with-alzhe...