Some people daydream for hours on end, playing out a single storyline for decades – and it can be hugely distressing. Here's how to tell when your daydreaming has gone too far. When I speak to Colin Ross, a psychiatrist and researcher based in the US, I tell him that I have such vivid and immersive daydreams that I can make myself cry or laugh out loud. I also tell him that I have the power to dip in and out of them as I please, and that I enjoy them. He is impressed with my "athletic gift" and