OK, cheers guys!
I had some unexpected time to play last night and levelled a couple of times. As I was suspecting, once my Agility was maxed I only got two of the allocation points. But, I had been slightly concerned and was wondering if I'd have to avoid sleeping in order to not be stuck at the levelling screen or something
Anyway,
@Fable, question answered, so feel free to close this thread if you want.