two fires and sleep between them..if you have the wood make the reflector big.i have seen photos from the 1900's and these guys had the logs shoulder high in front of a lean to..
Back in the day, people who slept like this used wool, animal hide/furs, canvas etc that do not burn as easily.
Don't use this method with today's synthetic shell sleeping bags. If you are lucky, you may wake up in the morning with several burn holes on the exterior shell of the bag from fire sparks. If you are not so lucky, you will wake up very, very warm in the middle of the night and have the scars to prove it....like I do.