I don't know if I can forcefully, consciously stop. I've been doing it since I was about 5 years old. When I was five, I had this waking dream...I honestly don't know if I was awake or asleep, of an angel appearing at the foot of my bed startling me. The angel told me not to be afraid and that I was destined for great things. For a while, my fantasies centered around that theme but started morphing, becoming more adult, as I grew older. I can't say they've ever stopped completely, but under times of extreme household stress they become elaborate and can be somewhat consuming.