Our expert says:
Genuine sleep talking is often incoherent, and if coherent would generaly reflect what someone might normally say while awake --- so describing how one slept with someone would be really odd content for sleep-talking. As M says, maybe he knows you're listening and wants to bother you ? There is no research on the accuracy of what people say in their dreams ( it would be very hard to conduct such research ), so there's no way of knowing whether this is real, or fantasy, or fake,. other than by calmly discussing it with him.
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