What is Scrooge’s new approach in stave 3 as the clock strikes one?

Scrooge opens his bed curtains, so as to be prepared for whatever appears.

But finding that he turned uncomfortably cold when he began to wonder which of his curtains this new spectre would draw back, he put them every one aside with his own hands, and, lying down again, established a sharp look-out all round the bed. For he wished to challenge the Spirit on the moment of its appearance, and did not wish to be taken by surprise and made nervous.