Need some advice about heating a tent.

I've been camping lots of times before but find in the nights, it gets bitterly cold.
I have a well insulated tent, air mattress to keep me off the floor, high quality sleeping bag and use covers for added heat but still too cold for proper sleep.

I need something that I can turn on for a little while during the night to create some warmth, perhaps battery operated, gas or solar and needs to be portable and lightweight!

Any ideas? :confused:

Here is a good website about options for heating a tent safely. I have done a lot of camping over the years and always my best option was two very large dogs !

Hope you get something safe out of this website !

Heating Your Tent - OutdoorPlaces.Com (http://www.outdoorplaces.com/gear/equipment/heat)

Ms tick