However, other studies have shown that the impact of background noise on learners may depend on their personality. For example, a study done at University College London in 2010 found that white noise-like sounds and music actually weakened the introvert’s understanding, memory and learning ability. In other words, the effectiveness of white noise or other background sounds as a learning aid is still a personal experience rather than a sound scientific study. Although seemingly illogical, the idea that noise can help people fall asleep has been established. Devices that produce white noise have been a popular sleep aid for many years. Many people find that if it is not impossible, they can fall asleep without a white noise machine. For them, complete silence is a distraction. Because years of extensive research have shown that chronic insomnia can cause brain damage, doctors often recommend using white noise devices to treat sleep deprivation. In addition, white noise is sometimes used as an alternative treatment for tinnitus, a persistent ringtone that can disturb sleep. But how does white noise help people fall asleep?