Why can't a son-in-law sleep in his father-in-law's house?

? This is also sub-regional. I know this is not allowed. After the married daughter returns to her mother's house, the husband and wife still have to sleep in separate rooms. So many son-in-law don't want to spend the night at their parents' house. This is also one of the reasons. Not only do you have to go back to your mother's house, but also your husband and wife can't sleep together. The mold said it would bring ominous things to the guests.

? Because of the long journey, Xiao Wang went to his mother-in-law's house for five days this year. He came back and said he was depressed. New Year's Day is about 10 day. He will sleep separately at his mother-in-law's house for five days, and he can't sleep at night. I heard that his father-in-law came to make rounds from time to time to see if he was quiet. He gets up at four or five every day when he can't help it, so there is no one around ... just as he is about to go in,