Try to hack your body into feeling more relaxed so your scholarly zeal calms down a bit and lets your mind rest.

I'll tell you what works for me.

1. Start dimming the lights as you approach bed-time. You can buy electric tea candles (as you may have seen in restaurants) to provide low lighting so you can still get around your home. The candle-like flickering of the light is pretty calming.
2. Install f.lux (or its ilk) on any PC or mobile device with a screen.
3. If you listen to music, make sure it's relaxing. Playing nature sounds or whatever YT returns for "meditation music" works pretty well.
4. Don't underestimate olfactory senses. Buy an aroma diffuser and pick up some essential oils. Grapefruit or ginger scented mist can be seriously relaxing.
5. Keep some kind of whimsical treatise next to your bed so you have an outlet for what should now be sleepy intellectual curiosity: Godel-Escher-Bach is perfect for this.

Good luck! :)

EDIT: Oh, also what about psychoactive stuff like coffee and alcohol? Coffee in the afternoons can cause tossing and turning at night even though the wakefulness benefits are long gone. Alcohol is considered a CNS depressant but it can still lead to some difficulty sleeping because of other related effects.