And while I'm narrating other people's dreams, a nod to August Kekule's Benzene Dream - the problem of how the hydrocarbon chain that formed benzene was structured having bothered Kekule (and other Chemists) of the time, the answer came to him when he dreamed of snakes biting their tail, and realized that the structure of the benzene molecule would work if it were a ring...
That, at least, is as the tale goes. The facts (bare bones wiki) can be found here, a slightly less enthusiastic take can be found here. In any event the dream has so entrenched itself into the collective unconscious as a testimony to the power of the subconscious mind, it hardly matters whether Kekule ever had the dream or not. The moral is: Some people have useful dreams....