Ah. Okay, basically it happens in late fall, early winter, depending on the dragon.
The dragon will start to sleep more, away from lights, not want to eat or drink. I have read, and have been advised, to have a fecal at this time, since parasites tend to mirror the same behaviors in dragons. If you get an all clean, then turn off the lights, and let them sleep. Just wake them once a week for a lovely soak and bask, then off to nighty night again.
This period of time can last as little as a month to as long as 4-5 months.
So you are planning on breeding next year ? How old will your dragons be ?
Hope this helps out!
Janie.