Yes, "candle staring" is to improve concentration. Concentration, after relaxation, is the most important thing to apply correctly for astral projection.
Most people do not concentrate while going to sleep which is why most people do not have conscious astral projections.
You need to be able to be concentrating upon ONE thing at the precise moment your body goes into sleep mode.
As most people think of a million things (do not concentrate on anything) as they fall asleep and just unconsciously go into dreams...
Go beyond focusing on the "after image" and train yourself to visualize clearly, the candle still burning in your mind's eye. Stare at a candle for about 10 minutes, then lay down and actually ignore the after image, but just visualize the candle flame as vividly as possible.
This trains your concentration. Do this daily!
