One of the features[1] of Windows 10 is that there's only so long you can delay the updates. Oh, and now they've decided that since people were getting upset when updates were applied during the middle of their working day (e.g. while streaming videos, etc.), now updates will silently be applied overnight, restarting your system with no advance warning. Both reasons why I've been dragging my feet in switching to my Windows 10 box at work.

[1] Feature for Microsoft, I'm not convinced it's really a feature for the victims, er, users.