Sydney didn't end up being alone for long. Giles had spent much of his night on sentry duty, and, when he was done, he was a little too keyed up to try sleeping, so he figured that he could go to the kitchen and try to defrost some with a cup of tea. He didn't care if the caffeine ended up keeping him awake for longer or not.
When he walked in, he found Sidney walking around. "Sorry. Hope I didn't interrupt anything," he said with a slight smile to her.