LO sleeping through the night

Emily • 22. Married. Have one angel baby (1/19/14) and a baby boy (12/4/14)
LO has his last feeding around 9-10pm every night. He's been sleeping until about 3-330am, but the last two nights has been 4-5am. I've actually been waking up before him because my breasts are so full and heavy. I'm worried because I'm really prone to clogged ducts. Will my body adjust to him sleeping through the night?