Some people are aware that they are dreaming, which is called lucid dreaming. While lucid dreams are rarely frequent, and not everyone experiences them, Peters has been able to induce lucid dreaming in research participants with mental training and sensory stimulation. However, scientists don’t know why some people have control during a lucid dream, and others do not—at least, not yet. Echoing the online game Second Life, another participant rebuilt everything she knew, including her home and family, in the lucid dream state, so she could keep returning. Despite the potential downsides of lucid dreaming, studies have shown that dreams can be an opportunity to commit information into memory.