Have you tried melatonin or valerian root? Melatonin is produced by the pineal gland in your brain that makes you tired. And valerian root is a natural herb that causes drowsiness.

First of all it's difficult when you have to share a bed. Sleep alone and use the big bed for sex. That makes more sense. You need to use valerian or camomile tea, which are natural remedies.

But the best way I have found is to have a radio playing softly (earphone?) on a talk station. No music! Simply listen to every single word that is said. Pay attention. Do not miss a sentence. Make sure you understand everything you hear.

Then it's morning.

Good luck.