All 3 lived in the same apartment, had similar interests, hung out most of the day they werent at classes. I've done a little bit of reading into things like this, and training yourself to dream lucidly can be difficult, and having mutual dreams with similarities can be even harder, but having identical ones as often as they did without, as far as i know, training of the mind before sleep is just mind boggling. If one went away for a week or so, they wouldnt appear in the 'dreams' until they came back. One of them was skeptical and tried extensive cross examination, but it always seemed to check out. Dreaming is one thing, but discussing a dream as if it was real mentioned what each other did in it is just beyond comprehension.