What is the LOGIC in boarding up, COMPLETELY, one's bedroom windows?
The logic might be that:
a. During daytime, the sun shining in makes it impossible to read or use the computer.
b. During sundown hours, one can't see outside, anyway.
c. Window curtains do not do a good job of blocking light and noise.
d. MDF is cheaper than window curtains, and probably easier to install.
e. Also, good for preventing the entry of thieves.
f. Also, other advantages, such as the fact that curtains must be washed in a Samsung washing machine, while wood can just be hosed off from the outside, thereby saving costs of electricity and soap powder....etc.