That's cool, I thought I had suggested video games too but I guess I forgot. I used to know a guy who solved computer programming issues that way, problems he's struggled with for days. He'd dream the code he needed and then wake up and type it up for real.
Two more I remembered from books; once I was lying in bed imagining what it would be like to be a spaceborne paratrooper like in the original Starship Troopers; the book is very explicit about everything that happens, from the soldier being fired out of a cannon from the ship, his outer capsule burning away followed by a series of parachutes, and finally the still rough landing softened by the armoured suit's rockets. When I started, it was a daydream in bed. By the time I reached hard ground, I was dreaming it and there I was. I don't think there was a battle next but I can't remember for sure.
The other was "The Five and a Half Minute Hallway" from House of Leaves. For a whole week my dreams seemed to start with this. What's interesting is that in both these examples, the spacedrop and the impossible corridor, the short journey was like entering a portal into the other world. At least that's how I remembered it the next day. The "daydream" part may have been a sleeping dream which I only remembered as a waking daydream. Or something.