If I had Dr. Plastic give me some titties, I don't think I'd put them in the usual place. I'm thinking outside upper-thigh. I'm trying to imagine where my hands usually are located as I fall asleep, and I think that's it. Squeezing on some solid B cups as you drift off to sleep would be better than Melatonin. You don't need Double Ds for this purpose because then it's going to throw your pants and jeans game off quite a bit; no one needs to report to pleats to compensate for the new volume of flesh in your Dockers. You could get an A cup, but that's hardly worth it. Next you have to consider firmness. You need some give in them so you don't change every pair of pants into 18th century breeches, so barely 18-style perky cups probably aren't the best choice here. You don't want the fried egg nailed to a wall kind of sag on them either, because gross, but they're gonna have some hang to them. There is going to have to be some maintenance involved.
I think we're on the ground floor of a burgeoning new industry, here. Look out, Shark Tank.