Twilight awoke with a start, and felt about her chest for something that wasn't there, but that time it was mostly out of habit. A deep, rhythmic banging that echoed through the castle had awoken her, and it took her a moment to realise it was somepony knocking on the door, and therefore nothing she could blame Trixie for. She had no idea why that was currently her 'go to' explanation for unknown noises though.