Abortion Bill debate nears end

The lengthy and heated debate over a controversial bill to decriminalise abortion in NSW is nearing an end - with the State's Upper House to sit through the night until the legislation passes.

The final changes are being debated, including one amendment restricting late-term abortions.

That crucial change could be enough to appease the concerns of Liberal MP Tanya Davies, who has threatened to move to the cross bench if changes aren't made.