Thanks for the info I didn't realise there were so many other active ingredients.Note that curcumin should not be equated to turmeric, although many people seem to think these are more or less the same thing.
Only around 3% of turmeric is curcumin; but turmeric also contains various other active ingredients, such as demethoxycurcumin, bisdemethoxycurcumin, ar-turmerone, atlantone, and zingiberone.
In particular, ar-turmerone may inhibit microglial activation.†
You might want to try say 1000 mg of turmeric powder (= half of a level teaspoon) before bed to see if that helps sleep. I take this amount of turmeric each day for anti-anxiety purposes (see my anti-anxiety thread here). Taking too much turmeric can cause diarrhea, so you probably don't want to go above 2000 mg.
I've tried various doses of turmeric, with and without oil, up to around 6g, without any noticeable effect...