Serious safety concerns with living in same room as PLA 3D Printer?
You are probably pretty safe printing PLA


Regarding emissions, the following recent report, Emissions of Ultrafine Particles and Volatile Organic Compounds
from Commercially Available Desktop Three-Dimensional Printers
with Multiple Filaments, indicates that PLA is a pretty low emitter (1/20th of nylon) and most of what it out-gasses is Lactide which is low on the harm scale.  That said, everybody's nose sees things a bit different and people tolerate smells differently. Note also that we used to think lots of things (like asbestos) were harmless that we know differently now.  Note also in the figure below from the report that all PLAs are not created equal.  Dremel PLA produce way more nasty stuff than FlashForge PLA did.  I am also sure additives, colorant, and fillers can change this a lot as PLA filaments aren't not all PLA.


Regarding the fire safety issue.  Note that there is a BIG difference between a kit and a "product".  Since you are the manufacturer of the printer for a "kit", the packager of the "kit" is not responsible for the fire or electrical certifications of the final product.  This does open the door to some risks.  The biggest risks are electrical safety; but, fire safety can be an issue as well.  I would say that the risk is likely higher to you personally when the printer is NOT in your bedroom as if it catches fire when you are sleeping, you will likely catch the fire faster if it is in your bedroom.
From a practical standpoint, I have heard several people complain that they can't sleep when the printer is printing when the printer is in a separate room.