Read it through once

I could not tell: nothing answered me; I then ordered my brain to find a response, and quickly. It worked and worked faster: I felt the pulses throb in my head and temples; but for nearly an hour it worked in chaos; and no result came of its efforts. Feverish with vain labour, I got up and took a turn in the room; undrew the curtain, noted a star or two, shivered with cold, and again crept to bed.