You Should Maintain a Steady Temperature in Your Sleeping Bag.
Even in the middle of the sweltering heat of July, the temperatures in the forests at night can drop to a very frigid level. Because of this, it is essential to make certain that your tent has adequate insulation so that your body does not have to exert as much effort to keep you warm during the night.
If you want to, you can keep the fire running through the night, but if it goes out, you should be prepared to wake up in a tent that is bone-chillingly cold. One more possibility is as follows: When you want something to drink that will revive you, keep a couple bottles of water that have been boiled on hand. If you put them in your sleeping bag thirty minutes before you go to sleep, you will wake up with a toasty spot to put your head on since they will keep the bag warm.