Approaching any Who episode with an eye toward strident logic is a fool's errand. You can let the timey-wimey stuff slide, but consider this random little girl waking up in the middle of the night. Very minor spoilers.
So...what exactly is that you're smoking? Keeping the ashtray by the window so the smoke wafts outside? Think there's something under the bed? Feeling a little paranoid there are you?
This has been your Doctor Who nitpick of the week.