Individual insulation tent

This is probably out there, but the idea about the little candle device with the terracotta pot made me wonder about this Is there any type of tenting device that one could sit in and use some sort of portable heating device inside of the tent even within a house. It would only have application if you knew you would be at one specific spot , like a computer and desk, for long periods. Obviously there would be issues with air flow and any exhaust from a heat source in an enclosed area. Also probably not good for for claustrophobic s, and a pretty limited ambiance in general. Alternatively, some one could of course simply design a very small room for such a purpose as well.

The smaller the space, the less energy required to heat it.
This tent of which you speak makes good sense from an energy standpoint, but I'd hate to be confined to a tiny space all day. If burning a fuel, the space will need to be ventilated.

The computer desk is becoming standard apparatus for the digital age. Back in college, in order to gain space, it was common to build a bed loft, putting the desk underneath. It would not take much to enclose the space under the bed-just hang blankets. A 4' high space would be about right for a chair, 30" for the desk, it will fit easily in standard construction. As an added bonus, the bed space is reduced and raised, offering a warmer nights sleep.

A small electric space heater would roast you in such a small space after a few minutes. A light bulb and the computer might be all you need. I would, of course, need a coffee machine in there.

I built something similar as an experiment. It's a simple "box" made around my bed made from foam board insulation. It's tall enough to sit up in when you are on the bed. Since it is very much in the experimental stage, it doesn't even have a door yet, I just lift it to get in and out. It works great and holds your body heat in to a large degree, but something you could see thru would be a much better option. Also, if anyone plays with the idea, you will want to cut some vents into the foam board.

It's a good idea but one needs to be careful. Depending on how cool you keep it minute condensation of moisture can occur which promotes the growth of mold. Ventilation and a dehumidifier can be 2 means to combat this problem but it is something to be aware of.

I never understood the logic of people wanting a large bedroom.
That is where you go at night to close your eyes and fall asleep.

You need space for a bed, closet and a set of drawers, plus a little maneuvering room.
Anything beyond that is going to cost you big bucks in energy.
A 400 sq ft room will take 2X energy to heat (or cool) as a 200 ft room.

If your bedroom is off of the heated living room, leave the door open in the evening while the stove is burning.
Set a tiny box fan (a 4"er will do fine) on the floor to exhaust the cold air out of the bedroom.
As the air is exhausted, the vacuum will draw in warm air from up high.