The Mummy and Miss Nitocris by George Griffith

This time he was very much awake. In fact, his sense of wakefulness seemed almost superhuman. His faculties were preternaturally alert, and he had a feeling of what might properly be called mental extension -- it was not exaltation -- - which seemed to widen his mental vision enormously. Problems which had puzzled him to desperation suddenly became as obvious as the first axioms of geometry. In short, he felt as though he had become a new man, re-born, or re-incarnated, into another world which contained the one he had so far lived in, but which was infinitely vaster in some undefined way which was not yet plain to him.

He lay for some time thinking over the extraordinary happenings of the evening and his dream, which he remembered with astonishing exactness of detail. Then a sudden turn of thought carried his mind to the subject of miracles, apparitions, ghosts, and mathematical impossibilities such as squaring the circle and doubling the cube -- and to his amazement he found that the impossible of yesterday had become the possible -- nay, the almost absurdly obvious of to-night.