Hi master 

as rooms are very small these days, I’m thinking of using a wall bed (also known as Murphy bed) for myself. Want to check if there is any feng shui implications of using a wall bed, and anything to look out for? 
 

this way during the day, I can keep the bed up and free the floor space for doing other things like prostrations/ meditation / floor seating / yoga etc. 

thank u 

In my opinion, no issue.

However for bunk beds parallel to say the living room wall, be careful of EMF radiation (if any) especially for the upper bed.

Thank you master