Sleep!

Early on it's important for both you and baby to get your rest. Later on people have difficulty getting their little one to sleep at night. I think the best thing to do here is start off early. As soon as you bring your little one home you should try letting your baby learn to sleep in his or her bed at least once a day. Increase it as they get older and try to let them fall asleep on their own. This will help alleviate most sleep problems that mothers run into around 3-6 months.
If your baby is already past 3-6 months and he/she will not go to sleep at bed time there are a few things you can do help. There are many "no cry" sleep solutions out there and many many books. Most books have the same information on this topic, so you pick on that you are comfortable with and find easy to read. It is likely that at this point your baby is used to you helping them fall asleep, so it may be tricky to teach a new habit to your baby at this point. It's not impossible though. The most important thing to do with your baby to help them sleep is a bed-time routine that consists of at least 3-5 steps. You should do these 3-5 steps every night at the same time. The most common bed-time routine steps are: bath time, read a book, light massage, and feeding. Your baby will pick up on the routine pretty quickly and will realize that it's time for sleep and not play. It is also a good idea to keep things quiet and low-key about an hour before bedtime so your little one can unwind. Excessive play at this time might just give your baby a "second wind" or burst of energy making it harder for them to go to sleep.

At times it might seem impossible and endless, but do know that eventually all babies do learn to fall asleep on their own in time. Good luck to all the sleepless mothers out there!