Dreaming or Awake? Lucid Dreams Between Experience and Neuroscience

Article written in collaboration with @neuro.sleepills 

Anyone who has ever had a lucid dream remembers that precise moment: the feeling that something doesn't add up, followed by a sudden realization — "I'm dreaming." It's an experience that sits on a borderline territory, halfway between sleep and wakefulness, and one that has increasingly captured the interest of cognitive neuroscience in recent decades.

What is a lucid dream

Dreaming in general can be defined as a subjective perceptual experience internally generated by the brain during sleep, in which elements of wakefulness, external environmental stimuli, and bodily state intertwine within a dynamic, integrated system (Hobson et al., 2000). The lucid dream represents a particular case within this system: the moment when, within the dream experience itself, an awareness of dreaming emerges (LaBerge et al., 1981).

This awareness is not an all-or-nothing phenomenon. The literature instead describes a continuum ranging from a pre-lucid phase, in which the dreamer senses something is off without reaching full awareness, to states of stable lucidity and, in the most advanced cases, dream control, in which the dreamer is able to voluntarily modify the content of the dream (Voss et al., 2009).

What happens in the brain

From a neurophysiological standpoint, the lucid dream is described as a hybrid state, sharing characteristics of both REM sleep and conscious wakefulness. Most lucid dreams observed in laboratory settings do in fact occur during REM sleep (Dresler et al., 2012). Neuroimaging studies comparing episodes of lucid versus non-lucid REM sleep have revealed greater involvement of fronto-parietal networks, areas typically associated with higher-order cognitive functions such as metacognition and self-reflection (Dresler et al., 2012; Voss et al., 2009).

This finding is consistent with the three cognitive components that characterize the lucid experience: the metacognitive capacity to recognize the ongoing experience as a dream, the maintenance of self-reflective awareness throughout the dream experience, and the activation of executive functions that, in some cases, allow the dreamer to plan actions and voluntarily alter the dream itself (Baird et al., 2019). It should be noted, however, that no single, universally accepted neurophysiological signature of lucid dreaming has yet been established: available findings come from small samples and heterogeneous methodologies, and research in this area is still very much in development.

The methodological problem: how do you study a private experience

Studying dreams poses a unique challenge: researchers have no direct access to what the dreamer is actually experiencing. For decades, the only available tool was the dreamer's account upon waking — data that does not reflect the dream itself, but rather its memory, inevitably reshaped by processes of memory and reconstruction that occur after waking.

A turning point came in the 1980s, when Stephen LaBerge and colleagues introduced a paradigm for voluntary communication from REM sleep: by exploiting the persistence of eye motility during the muscle atonia typical of REM sleep, lucid dreamers could signal from within the dream the exact moment they became aware, through prearranged patterns of eye movement (LaBerge et al., 1981). This paradigm, innovative as it was, still presents methodological limitations tied to the indirect nature of the signal, and remains a subject of ongoing scientific debate.

More recently, the paradigm has been expanded to enable genuine real-time dialogue between experimenter and dreamer during REM sleep, using motor signals and even responses to simple questions posed from outside (Konkoly et al., 2021). These studies represent one of the most promising approaches today for investigating the neural correlates of dreaming and the mechanisms underlying lucidity.

Toward clinical applications

Interest in lucid dreaming is not purely theoretical. Several lines of research are exploring its potential clinical applications. In the case of recurrent nightmares, the hypothesis is that lucidity may help modify the emotional response to the nightmare itself, opening the way to interventions aimed at psychological well-being (Macedo et al., 2019). A second line of research concerns motor rehabilitation: movements performed during a lucid dream appear to activate motor networks that could, in theory, be useful in rehabilitation pathways based on motor imagery. Finally, the heightened awareness typical of lucidity has been associated with a possible enhancement of the ability to generate new associations between ideas, with hypothesized implications for creativity and problem solving.

It's important to note that, however promising the evidence may be, no consolidated clinical protocols validated on a large scale currently exist (Baird et al., 2019). For now, this remains a field of evolving research rather than a mature clinical practice.

Conclusions

Lucid dreams remain one of the most fascinating frontiers in sleep neuroscience, precisely because they sit at the intersection of subjective experience and objective inquiry — a phenomenon that challenges traditional scientific methods, forcing researchers to invent new tools to communicate with a mind that, while asleep, remains in some sense awake. Many questions remain open — about the exact nature of lucidity, its specific neural correlates, and its real therapeutic applications — and it is precisely this incompleteness that keeps this field of research so alive.

References

Baird, B., Mota-Rolim, S. A., & Dresler, M. (2019). The cognitive neuroscience of lucid dreaming. Neuroscience & Biobehavioral Reviews, 100, 305–323.

Dresler, M., Wehrle, R., Spoormaker, V. I., Koch, S. P., Holsboer, F., Steiger, A., Czisch, M., & Obrig, H. (2012). Neural correlates of dream lucidity obtained from contrasting lucid versus non-lucid REM sleep: A combined EEG/fMRI case study. Sleep, 35(7), 1017–1020.

Hobson, J. A., Pace-Schott, E. F., & Stickgold, R. (2000). Dreaming and the brain: Toward a cognitive neuroscience of conscious states. Behavioral and Brain Sciences, 23(6), 793–842.

Konkoly, K. R., Appel, K., Chabani, E., Mangiaruga, A., Gott, J., Mallett, R., Caughran, B., Witkowski, S., Whitmore, N. W., Mazurek, C. Y., Berent, J. B., Weber, F. D., Türker, B., Leu-Semenescu, S., Maranci, J.-B., Pipa, G., Arnulf, I., Oudiette, D., Dresler, M., & Paller, K. A. (2021). Real-time dialogue between experimenters and dreamers during REM sleep. Current Biology, 31(7), 1417–1427.

LaBerge, S. P., Nagel, L. E., Dement, W. C., & Zarcone, V. P. (1981). Lucid dreaming verified by volitional communication during REM sleep. Perceptual and Motor Skills, 52(3), 727–732.

Macedo, T. F., Ferreira, G. H., Almondes, K. M., Kirov, R., & Mota-Rolim, S. A. (2019). My dream, my rules: Can lucid dreaming treat nightmares? Frontiers in Psychology, 10, 2618.

Voss, U., Holzmann, R., Tuin, I., & Hobson, J. A. (2009). Lucid dreaming: A state of consciousness with features of both waking and non-lucid dreaming. Sleep, 32(9), 1191–1200.