Even with reflectors, I think any candle with a flame needs at least 12" clearance from anything flammable, especially above.
I don't know if I'd go to sleep (or sleep very well) with a live candle in a nylon tent -- too many variables for my comfort. If it was in a big tin can, sand on the bottom, some arrangement to ensure it couldn't touch the tent or my sleeping bag, and very reliable ventilation, then okay. But that's more for a bit of heat (forced convection = moisture movement outwards = sleep dry and warm).
Frankly, when LEDs came out, I lost all interest in candle lanterns.