However, after stopping the conditioning, sleep time returned to the average range of baseline and conditioning time. It is the process called extinction. Extinction states that when reinforcement/punishment stops, behavior returns to baseline. This phenomenon shows that conditioning is effective in a short period of time. Conclusion In the sleep procrastination modification experiment using operant conditioning with positive reinforcement, the effectiveness of conditioning changes during the conditioning period. This shows that the stimulus is effective for me to some extent. But the response data also shows that the extinction effect of operant conditioning disturbs the outcome of the experiment. Trying to reduce the disturbance, I should lengthen the time of the experiment to make the conditioning work better. In conclusion, the experiment works well by choosing positive and suitable reinforcement