I have same problem as you. My boy is 3 mths old almost the same as you. At night i also谷奶 too. So i wake my bb up to feed just one time at night even he didn't cry for milk. He usually drian it but only one side. So the other side i have to pump out the milk with my hands. If 谷奶 not serious, then i let it be because pump the milk at night i feel very tired and i hate to that at night.
Also, to avoid乳線炎, try don't buckle up your 胸圍at night or in day time if possible.
If we wake up BB to eat at night, then our body will continue to produce milk wor. Last night (this morning at 5:00 a.m to be exact), I got out to express milk. Really can't stand the pain!!\
I usually put a think towel under my bra so that the milk will not wet my bed.
How long does it really take for the body to adjust???
After my bb finished draining one side of my breast, he would fall to sleep immediately. Of course i have to express the milk out of the other side. Because 谷奶 is very pain. The reason i wake bb up is that i don't have to express the milk for both of the breasts because it will take an hour long.
Actually, i am sure am i right or not. Because some people say better to leave bb keep sleeping. Good sleeping is also good for his health.
I would also like to take this time to ask for that should i wake bb up at night to bf? i'm still not much experience on bf. I have a lot to be learned. Thanks for any advice.