What has discovering Amnesia/Frictional Games done for you?

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So I didn't sleep at all last night due to Penumbra: Black Plague, again, which is really surprising to me. The game is actually just as scary a second time, even though (and maybe because) I know what's going to happen in advance. I even found myself sneaking around in the first hub area even though I knew there was nothing there; it just feels so unsafe. I still think the last area in the game is utterly horrifying, more so than anything in Amnesia.