Though babies and even toddlers tend toward frequent night waking, there are things you can do to help them sleep more restfully. Ensuring they are comfortable in the cold, dry Denver climate can go a long way toward helping everyone get more sleep.
First, make sure baby is warm enough. Whether they are sleeping in your bed or in their own, babies under one shouldn't sleep with loose blankets. And toddlers tend to kick off the blankets. Try dressing them in layers for bed just as you would for day time. Blanket sleepers, or "footed pajamas," layered over a long sleeve t-shirt and leggings will keep a baby toasty warm. While you want to avoid overheating, keep in mind that most families keep their homes cooler at night and babies don't sleep under the piles of warm blankets adults do. A warm baby will wake less frequently through the night.
Second, consider that the dry air may be causing discomfort for your child. A child that is dried out will wake frequently to nurse - not from hunger but from thirst. Consider using a cool mist humidifier in the room where your child sleeps. Also, dry nasal passages can be extremely uncomfortable. Try a saline spray, such as Little Noses, before you put your child to bed. No saline spray handy? Breast milk will also do the trick!