She had long since raised the dose to its highest limit, but tonight she felt she must increase it. She knew she took a slight risk in doing so—she remembered the chemist’s warning. If sleep came at all, it might be a sleep without waking. But after all that was but one chance in a hundred: the action of the drug was incalculable, and the addition of a few drops to the regular dose would probably do no more than procure for her the rest she so desperately needed. . . . She did not, in truth, consider the question very closely—the physical craving for sleep was her only sustained sensation.