I WAS going to answer that untill I read this..
Let me clarify something here. "Soundproofing" and "treatment" are entirely two different aspects of studio building. This misconception is common, to the point that certain "foam" companys advertize their foam treatment products as "soundproofing foam" ....which is totally assinine.
If not totally fraudulent as they seek to take advantage of nubees who want to build a homestudio. Furthermore I can't believe the members above didn't clarify this point themself.
Nothing could be further from the truth. Besides contridicting yourself, your view isn't necessarily shared by a majority of Home studio builders...even those who DO sleep in the same room as their studio. Afterall, a simple search over the last year of posters on this forum will verify that reality. The fact is, carpet and a mattress does nothing for Low frequency absorption, which ALL small rooms need as much as you can get. I suggest you do some research. And then offer advice, as your current advice is less than helpful.
Yes, if ANYBODY understands budget limitations, its me. However, OVER TIME, if you want to improve the acoustics of your studio environment, you MUST use things that are not free, nor easy to implement. That is the fact. Untill you understand that monitoring in a room that lies to you, and then mixing a lie in the same room again leads to TRANSLATION HELL. Period.
The fact is, most people here who record "live" sources, such as a microphone in the same SMALL room as you are monitoring, knows damn well you can't monitor over speakers in the same room as the mic is placed. That means headphones, which is bad enough, but given a small room with combfiltering hell, deep peaks and nulls, and close proximity between mic and headphones, makes for very difficult if not impossible engineering excellence.
fitZ