My twins have begun to sleep longer at night (Obviously now that I've told you they'll stop!) I had been feeding them at 7pm, then about midnight, then about 3, then 7am. Yesterday they slept from 7pm right through till 5am - fantastic to get so much sleep, but my poor boobs, with a baby's-worth of milk each side, were seriously unhappy!
Any advice on what to do? Do I a) set an alarm to express in the middle of the night, assuming the twins have not woken? or b) do I sleep as long as they sleep, and cope with the rock hard boobs in the morning? I am terrified of getting mastitis, so I favour option a)...but I worry that if I do that my body will never adjust to the new schedule. 
Do your boobs learn to produce different amounts at different times of day? Will I eventually produce less milk at night, while having enough for 3-hourly feeds in the daytime?