You definitely start deciphering between what is worth possibly disrupting their sleep and what isn't, but this is also a prime opportunity to keep at work on that intimacy level between you and your husband too. It's so easy to let a baby run your life, and become your number one priority. The bad thing about this is that all of a sudden you can't remember the last time that you and your husband did something alone together, or did something at all, even with the baby. So, I never had a problem with taking the baby over to a friend's house and hanging out with my husband with them until late so that him and I could get out and keep up on our social lives. I also let my mom babysit my babies (I had a 15 month old when I had my second) and that would throw off their schedules, but it's worth it when you look at how important it is to also stay focused on your marriage. So, I guess I'm saying that yes, a baby can tend to run your schedule, but I do not think that it's a good idea to let the baby run you and your husband out of your time together. If this happens, it can put a major strain on your marriage. After all, the center of your family isn't the baby, it's you and the baby's daddy. All of the children, jobs, home, and extended family stem off of the center of you and him. You and your husband are the foundation, so make it a solid one.
I also want to add that my kids are on an extremely strict schedule also. They have a strict bedtime, feeding times, and naptimes. So, it's not that they can't predict their schedules, it's just that I don't see a bit of a problem in every once in a while, having it disrupted. I've done this since they were little babies, and yes, they may wake up once or twice that night instead of sleeping all night long, but isn't it worth it to spend some quality time with your husband? If it's not, then I'd switch your priorities around because it's easy for a marriage to take backseat when a baby arrives. We stay out late for family events that are out of town. My kids' bedtime is still 8:30 (they're 3 and 4) and a lot of times, we don't leave my family's house until 9 and get home at around 10. Well, it only happens once every other month or so, so one night of disruptions is nothing every now and then.