L.,
First, congratulations on the birth of your son! Your first baby is the most exciting and scariest thing ever. Second, you need to understand what normal sleep for babies looks like. If you want a book, I really enjoyed "The No Cry Sleep Solution" by Elizabeth Pantley. It was very informative about normal sleep, plus it gave tons of great tips for getting baby to sleep more. Despite the hype, it is neither normal nor desirable for babies to sleep all night long. Their tummies are very small and they need to eat often. Breastfed babies will nurse anywhere from every 1-1/2 to 3 hours around the clock for a good 12 weeks or so. This is normal, and it is GOOD for them. (Not so good for us, I know, but you'll get through.) Bottlefed babies can go longer, but they still need to eat during the night. The idea that babies can sleep through the night at 12 weeks MAY be true, but you also have to understand what the medical definition of sleeping through the night is - one stretch of 5 consecutive hours of sleep. That's it. Baby's frequent waking is a protective mechanism for him, and it is a good thing. In fact, many sleep experts believe that one of the causes of SIDS is that babies fall into such a deep sleep cycle that they are unable to rouse themselves and their brains shut down.
The first thing to understand is that night-waking is perfectly normal, and it actually protects babies. The next thing to understand is that it is normal for baby to only sleep when you are with him. Think of it this way - your son has been not just near you, but actually inside of you his entire existence. He has always heard your heart beat and the swooshing of your blood. He has always been wrapped tightly by your body. He has always been rocked by the motions of your movement. He has no concept of what it means to be "independent," nor should he at this age. Babies are biologically conditioned to be close to their mothers. They are incapable to taking care of themselves, so their bodies and brains are programmed to keep them close to you. Now, that being said, obviously you need to find something that works for you and him. I suspect that sleeping in a chair in his room is not the answer.
I would go back to bed and take your baby with you. I, too was concerned that my husband get his sleep because he needed to work the next day. I finally realized that I needed to work the next day too - I needed to take care of my precious baby, and that was just as important as punching a clock. Parenting is a 2-person job. If you are bottlefeeding, let your husband get up for one feeding during the night. Trust me, he can handle it. If you are nursing, then life will be even easier. Learn to nurse your baby lying down, then you can nurse him in bed while you doze. You will not roll over and crush him, and he will not fall out of bed. There is a wonderful book called "Sleeping with your baby" by James McKenna. It's very short and an easy read. I read it in less than 2 hours. It talks all about the benefits of cosleeping, the many ways that it can occur and how to do it safely. Baby can share a bed with mom, or he can be in a bassinet next to your bed, or he can be in his own crib in your room. I suspect that once you master nursing lying down and just let your baby sleep with you for a while, you will all be getting more sleep. Because he is close to you, you will find yourself responding more quickly, so he is unlikely to go into full crying mode. All my little ones had to do was to roll close to me and start whimpering, and they were quickly being fed. You and your husband will probably be surprised to find that the baby won't disturb him at all.
As your son gets older, you can transition him out of your bed, and it will not be a traumatic event. My girls both started out in our bed. They were in a bassinet next to our bed by the time they were about 3 months old. By 5/6 months, they were in their own crib in the nursery for part of the night. By around 10 months, they were in their own bed all night. No tears and plenty of sleep for everyone. Now they are both great sleepers and sleep through the night - all the way through the night, not just one 5-hour stretch! One thing to keep in mind is that all the reputable sleep training books recommend against trying to teach a newborn to fall asleep on their own. They are incapable of learning it. It's like trying to teach a 5-year-old trigonometry. Even Ferber, the father of the Cry It Out method does not recommend his methods until baby is AT LEAST 4 months old.
Anyway, I hope you and your family are able to find something that works well for all of you. Unfortunately, the first three months can be pretty tough no matter what you do. However, they pass faster than you can believe. Remember that at this point, you cannot spoil your son. He is NOT manipulating you. Until he is around 6 months or so, his wants are his needs. He needs you to stay close to him. One of my favorite parenting quotes is this, "A need met goes away." On the flip side, if you ignore a child's needs, they just become more intense. This is when you get hysterical screaming fits that last for hours, night fears, and super-clingy babies and toddlers. Your son will grow to be independent when it is appropriate. Now is not that time. Treat your son gently and with loving compassion for his feelings and needs, and you will never regret it.
Best of luck,
S.