In lucid dreams the dreamer is aware of dreaming and often able to influence the ongoing dream content. Lucid dreaming is a learnable skill and a variety of techniques is suggested for lucid dreaming induction. This systematic review evaluated the evidence for the effectiveness of induction techniques. A comprehensive literature search was carried out in biomedical databases and specific resources. Thirty-five studies were included in the analysis (11 sleep laboratory and 24 field studies), of which 26 employed cognitive techniques, 11 external stimulation and one drug application. The methodological quality of the included studies was relatively low. None of the induction techniques were verified to induce lucid dreams reliably and consistently, although some of them look promising. On the basis of the reviewed studies, a taxonomy of lucid dream induction methods is presented. Several methodological issues pertaining to both studies reviewed and lucid dream induction research in general are discussed.

In a lucid dream the dreamer is aware of the dream state and can carry out actions deliberately. Lucid dream practice (LDP) is the rehearsal of movements during lucid dreams and constitutes a specific form of mental practice. Previous studies demonstrated that LDP can enhance physical performance. To gain deeper insight into LDP on a qualitative level, sixteen semi-structured interviews were conducted with lucid dreamers from different countries. Inductive content analysis revealed that many different sports and movements can be practiced in lucid dreams. LDP experiences were very realistic, including kinesthetic perception. Required equipment or sparring partners usually were available or could be created and adjusted by the athletes. Thirteen interviewees (81.3%) reported positive effects of LDP. In particular, 10 participants reported to have improved their physical performance through LDP, confirming findings of previous studies. Other positive effects were, for example, strengthened confidence, insights for physical practice (PP), improved flexibility, and positive emotions. The results also demonstrate the special possibilities of LDP like deliberate manipulation of practice conditions, speed, and perspective. Furthermore, problems occurring during LDP are described and how they can be dealt with. Based on the results, practical advice for interested athletes is provided. In conclusion, the present study demonstrates the great potential of LDP for sports practice. LDP could also be applied in other areas that involve motor learning, like rehabilitation, music, or surgery. The present study complements previous LDP findings and provides input and new ideas for future LDP studies. Furthermore, it is an important contribution to general MP research. Findings from LDP research–a small but growing field–should be incorporated into conceptual discussions on MP. Also, by extending LDP research, athletes and coaches could become more aware of this unique and effective method and could start to integrate it into sports practice.

In a lucid dream, the dreamer is aware of the dream state and can deliberately practice motor skills. Two field studies indicated that lucid dream practice can improve waking performance in simple motor tasks. The present pilot study investigated the effect of lucid dream practice in a controlled sleep laboratory setting, using a pre-post design with dart throwing in the evening and morning. The experimental group practiced darts in lucid dreams. Because some participants were distracted during lucid dream practice, the group was divided into lucid dreamers with few (n = 4) and many distractions (n = 5). Change of performance was compared to a physical practice group (n = 9) and a control group (n = 9), showing a significant interaction (P = .013, η = .368). Only the lucid dreamers with few distractions improved (18%) significantly over time (P = .005, d = 3.84). Even though these results have to be considered preliminary, the present study indicates that lucid dream practice can be an effective tool in sports practice if lucid dreamers find ways to minimise distractions during lucid dream practice. Moreover, the study emphasises the necessity to investigate lucid dream practice experiences on a qualitative level.

In a lucid dream, the dreamer knows that he or she is dreaming and can thus deliberately carry out actions. The original goal of this study was to investigate musical practice in lucid dreams and its possible effects as well as the quality of the experiences. A total of 5 musicians were interviewed about their lucid dreams in which they had played instruments and sung. However, the interviewees were more interested in pleasure and inspiration than in actual practice and skill improvement. Therefore, the results provide more general information than planned. It could be shown that singing and playing musical instruments mostly work well in lucid dreams. Lucid music dreams were often accompanied by positive emotions and led to several positive effects in waking life, like facilitated guitar playing and enhanced confidence. Two interviewees especially enjoyed improvising solo in lucid dreams. The participants also emphasized the creative and inspirational potential of lucid music dreams, which is worth further investigation. Combining previous research on athletic practice in lucid dreams and the clues obtained from this study, it is likely that musicians could use lucid dreams to improve their skills. Future studies should further explore the potential of lucid music dreams for both creativity and performance in waking life.

The relationship between time in dreams and real time has intrigued scientists for centuries. The question if actions in dreams take the same time as in wakefulness can be tested by using lucid dreams where the dreamer is able to mark time intervals with prearranged eye movements that can be objectively identified in EOG recordings. Previous research showed an equivalence of time for counting in lucid dreams and in wakefulness (LaBerge, 1985; Erlacher and Schredl, 2004), but Erlacher and Schredl (2004) found that performing squats required about 40% more time in lucid dreams than in the waking state. To find out if the task modality, the task length, or the task complexity results in prolonged times in lucid dreams, an experiment with three different conditions was conducted. In the first condition, five proficient lucid dreamers spent one to three non-consecutive nights in the sleep laboratory. Participants counted to 10, 20, and 30 in wakefulness and in their lucid dreams. Lucidity and task intervals were time stamped with left-right-left-right eye movements. The same procedure was used for the second condition where eight lucid dreamers had to walk 10, 20, or 30 steps. In the third condition, eight lucid dreamers performed a gymnastics routine, which in the waking state lasted the same time as walking 10 steps. Again, we found that performing a motor task in a lucid dream requires more time than in wakefulness. Longer durations in the dream state were present for all three tasks, but significant differences were found only for the tasks with motor activity (walking and gymnastics). However, no difference was found for relative times (no disproportional time effects) and a more complex motor task did not result in more prolonged times. Longer durations in lucid dreams might be related to the lack of muscular feedback or slower neural processing during REM sleep. Future studies should explore factors that might be associated with prolonged durations.

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