| Sumario: | In an experiment with a single participant, the author, signals from a weak vibrator were presented at random time intervals to the participant, while he was ready to fall asleep at night. A pilot test of twenty 15-minute sessions indicated that this sleepy attention to the signals produced a reduction of the signal frequency, z = 2.45, p = .014, two-tailed, and a bunching of the signals along the time axis, z = 1.63. The subsequent main experiment, comprising 40 night sessions, confirmed the signal frequency reduction, z = 2.24, p = .013, one-tailed, and the bunching effect, z = 2.85, p = .0022, one-tailed. In parallel with the night sessions of the main experiment there were added 40 day sessions in which the participant, exposed to the random vibrator signals, was fully awake and attempting to visualize vivid colors. These sessions gave a smaller reduction in signal frequency, z = 1.01, ns, and a slightly negative bunching effect, z = -0.71, ns. Reprinted by permission of the publisher. Reprinted by permission of the publisher.
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