midnight
There was nothing to do but to go to bed , which they were glad enough to do , as they would be warm in the sleeping bags . Seeing that the tent was securely fastened , and that their rifles were ready at hand , Mr. Baxter turned in . The boys were already asleep , for cold has the effect of making one drowsy . It was long after midnight when Fred was awakened by a series of loud howls outside the tent . At the same time Mr. Baxter and Jerry sat up . `` What 's that ? '' asked Fred .