The Golden Scorpion by Sax Rohmer

Keppel Stuart, M.D., F. R. S., awoke with a start and discovered himself to be bathed in cold perspiration. The moonlight shone in at his window, but did not touch the bed, therefore his awakening could not be due to this cause. He lay for some time listening for any unfamiliar noise which might account for the sudden disturbance of his usually sound slumbers. In the house below nothing stirred. His windows were widely open and he could detect that vague drumming which is characteristic of midnight London; sometimes, too, the clashing of buffers upon some siding of the Brighton railway where shunting was in progress and occasional siren notes from the Thames. Otherwise—nothing.

He glanced at the luminous disk of his watch. The hour was half-past two. Dawn was not far off. The night seemed to have become almost intolerably hot, and to this heat Stuart felt disposed to ascribe both his awakening and also a feeling of uncomfortable tension of which he now became aware. He continued to listen, and, listening and hearing nothing, recognized with anger that he was frightened. A sense of some presence oppressed him. Someone or something evil was near him—perhaps in the room, veiled by the shadows. This uncanny sensation grew more and more marked.