Is there a right way to put a bed into a bedroom?

This is the layout of my room -- Of course 4 walls. If you go by the wall that is at front of house, that has 2 windows. Lets call that the right side of room. So, the right side has 2 windows plus 1 vent (air vent). Left side has nothing except 1 vent. The top part has 1 window. The bottom is my closet plus a few inches (my dresser and mirror is here, and I already know that wherever I re-arrange furniture theres no room for this or anywhere to put it, so it has to stay there).

My mom says that there is a right way to put my bed into by bedroom. According to her, you not supposed to put bed where vents or windows are, which leaves bed in middle of room. When I will be re-doing room soon, she says she going to make me not put bed against any walls cuz of that rule (where you cant put bed against any of wall in room cuz of windows and/or vents). Apparently thats why she put my bed in middle of room years ago.

Honestly though, I never heard of it. When I look at articles online on how to rearrange bedroom furniture, they say you can put it against the walls. Going by real life and not by what I see online, no one seems to do that and they say you can put it against walls that have windows, and you can cover vents too.

On a side note, my room is literally small -- house is custom built house and back when original people had it, they made an office since they didnt have kids. They built 1 bedroom (aka master bedroom) plus 2 office rooms.