A.M.
First I would read "healthy sleep habits, happy baby" by dr. mark weisblut. Then I would stop interrupting his sleep. You wouldn't deprive a child of food, don't deprive him of his sleep. All the errands can be done at another time or even not at all. This is not a permanent state, it is for the first few years.
For night time, if he wakes in the night, let him fall back to sleep on his own. A few days of that and he will sleep through the night fine. Sleep begets sleep, so make sure he gets as many naps as he needs during the day. At his age, he likely needs at least two naps during the day and if he needs 3, that is fine too. Don't let him get overtired where he will then melt down. The moment he has signs of tiredness, put him down to fall asleep. In my parenting class, our teacher always tells us something that is very useful "this isn't forever, it is for now" Also the book "Smart Love" by martha heineman pieper and william pieper is very good. It helps but things in perspective and gets us to realize that children shouldn't have to squeeze into our schedules and be crumpy accessories, they have profound needs as little ones, and we will all do better if their needs are met.