I just wanted to recommend a Kindle light that I bought for my wife:
http://www.amazon.co.uk/OCTOVO-Solis--r ... 565&sr=8-3
It's bright without being intrusive, so she can read during the night without waking me, and it runs for ages off a single AA battery. It's also lightweight and not very bulky or cumbersome. Definitely one of those 'why didn't we buy it earlier' purchases.
The only problem we're finding is that one of our cats starts chasing the shadows about at night when it is on!

Gord