Mirror are more powerful then you thought.
A home with Windows, feels good. It extends your room. People feel like looking towards it. However not everyone is lucky to have multiple windows inside each room. I can solve your problem to some extent.
You cannot break the wall to make a window. What you can do easily is use mirrors. Mirrors act like a window. IT reflects corners and walls of whole room. IT extends your room, making your room look bigger.
Many small restaurants make use of big wall size mirrors on wall. It simply multiplies actual space. Inside your home, sometime it may not be a good idea to use a very huge mirror. Rather you could use Back-Painted Glass which reflects to some extent. It you’re your room continue in depth a little further. But ofcourse a window size mirror on wall is excellent idea to create a window like feeling for your brain.