<p>Hi</p><p>Would you say that these two sentences are fully natural?</p><p><i>(The alarm failed to wake the speaker.)</i></p><ol><li><b>I don't know how I<span style="color:#ff0000;"> missed the alarm. </span></b></li><li><b>I don't know how I <span style="color:#ff0000;">slept through the alarm.</span></b></li><li><b>I don't know why I couldn't wake at <span style="color:#ff0000;">the alarm.</span></b></li></ol><p>Thanks,</p><p>Tom</p>