Great conversation Tony! I’ve tracked my sleep with an Oura Ring for about 10 years and my sleep hygiene is pretty dialed in. My two main issues are: 1. Waking between 3–6am and sometimes being unable to get back to sleep. 2. Nocturia, despite investigating it extensively without finding an obvious cause. I’ve started thinking about sleep less as “which sleep aid works?” and more as which biological sleep lever is actually driving the problem. At the moment I see eight main categories: 1. Histamine / wake-drive blockers — mirtazapine, diphenhydramine, low-dose doxepin. Mirtazapine worked exceptionally well for keeping me asleep, but the half-life was too long and I felt groggy for days. 2. Orexin antagonists — daridorexant, lemborexant, suvorexant. These seem interesting for people who fall asleep easily but wake early and suddenly feel switched on. 3. Noradrenergic / threat-arousal reducers — prazosin, clonidine, guanfacine. Relevant where awakenings involve vivid dreams, pounding heart, adrenaline or sudden alertness. 4. Melatonin / circadian agents — melatonin, ramelteon, agomelatine. Melatonin helps me fall asleep quickly, but doesn’t reliably keep me asleep. 5. GABA / inhibitory compounds — gabapentin, pregabalin, eszopiclone, zolpidem, phenibut etc. I generally respond well to GABA-related substances, so this pathway may be relevant too. 6. Neurosteroid / hormonal signalling — pregnenolone, progesterone/allopregnanolone-related pathways, testosterone/estradiol state. Hormonal state seems to have a noticeable effect on sleep and nervous-system regulation, so I think this pathway is worth considering too. 7. Peptides / circadian-regulation compounds — DSIP, Epitalon, Pinealon, Selank/Semax depending on the goal. These seem to influence sleep architecture, circadian rhythm or nervous-system regulation through somewhat different mechanisms. 8. Supplements / nutrients — magnesium, glycine, inositol, phosphatidylserine, theanine, GABA, taurine, apigenin etc. These can influence inhibitory tone, stress signaling or sleep architecture, although responses seem very individual.