Wool and fleece over a very absorbent diaper keep the moisture where it is supposed to be. These fabrics are not as prone to wicking so baby's clothes stay dry. They also breathe so baby is staying at a more comfortable temperature.
You def sound like you need a much more absorbent diaper for nightime.
Married to my best friend, living the navy wife life, and loving every minute of being a SAHM to DS (born July 2011)!