One possible explanation, the dualist, that's the ghost of your mother, immaterial soul that she is, communicating to you while you're asleep.

一个可能的解释,二元论者会说,那是你妈妈的鬼魂,她是一个非物质的灵魂,在你睡觉的时候跟你交流

耶鲁公开课 - 死亡课程节选