I also couldn't do side lying nursing for quite a while. After DD was a bit older though it was so much easier!
The strangest thing has happened with sleep in our house. We recently moved houses but haven't sold our old place left so had left all of our furniture there to have it staged for open houses. There is a queen sized bed in the master bedroom in the new house and with my rapidly expanding belly we all felt pretty cramped. DD has slept with us since birth but had a stint for about 8 or 9 months (I can't remember how long) where she slept in a toddler bed in our room I'd say 90% of the time. She decided at some point she wanted to sleep in her own room so we bought her a twin bed, she picked out the bedding, etc. etc. She was back in our bed every night after that lol
A couple of weeks ago we finally decided to start moving our furniture over to the new house. DP set up DD's bed in her room (she had never slept in it) and she ADORES it. She's been in it every night since, completely her choice. She has slept thru the night most nights with a couple of calls on other nights where she wants to be covered up or something. The first couple of nights it was so odd for us...we felt really sad actually. Now we're grateful it happened so easily as the new baby will be here soon and will sleep between us. Now we just need to move our own king bed from the old house and sleep will be a whole new experience with all the changes!