Time for making a protest: 1:30am.
However, it didn't take long to get him back to sleep, and he then stayed in his bed until after 6am. Hurrah.
He has been tired for the last couple of hours but resolutely refused to go to sleep until he was given a feed. He finally dropped off a few minutes ago.
Update: I took him to bed after posting that and the silly boy woke up and is still awake half an hour later.