For many women, the breasts regulate themselves between 2 and 6 mths. I stopped being engorged and dripping around then. Some women will always leak or have a strong letdown all through their nursing lives.
So, if you are the average woman, your supply should start regulating better now and continue to regulate to about 6 mths.
Since the definition of "through the night" is 5 hours of sleep at one time, sleeping through the night in the adult sense is kinda rare. And, given that sleep is one of the first things affected by sickness, teething, growth spurts and developmental leaps, consistently sleeping through the night is very rare in breastfeeding babies.
They may spend a week sleeping for 5 hrs in a row (say from 10pm to 3am), but the next week they may suddenly need to nurse every hour or two hours for a few days due to being on the edge of learning how to sit, or starting solids or starting to teethe.
That said, since your supply depends on your baby's demand, a few days of sleeping for long periods should be enough to signal to your breasts that they need to produce less milk during that period. So, if your little one is sleeping consistantly from 8 till 2, let's say, a few days later, your breasts will regulate their supply downwards at that time.
If your engorgement is really painful, I would hand express a little milk to ease the pressure. If you want, you can take advantage of that extra milk and pump some for the freezer - a little stash of milk is always helpful at the oddest of times.