Sensory processing during sleep

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Sensory systems act as an interface between an organism and its environment, communicating relevant information to instructappropriate behavioural outputs, such as locating food, a mate or evading danger. Remaining alert to cues present in theenvironment is therefore paramount to survival and is a need that prevails even during sleep. To benefit from the restorativeproperties of sleep, animals transition into an unconscious state which is characterised by a marked sensory disconnection from theworld. This leaves them not only vulnerable but less able to respond to cues which may have a direct impact on their fitness. How doanimals balance the need to sleep with other competing behavioural drives? One solution is to remain partially awake, which someanimals achieve by sleeping one brain hemisphere at a time. Others, including humans and even fruit flies can rapidly wake up uponreceiving salient information, implying that some sensory neurons may act as awake "sentinels".Using the fruit fly olfactory system as a sensory-arousal model, I will determine which olfactory pathways have a privileged role inwaking and whether the neurons involved exhibit distinctive physiological properties or differentially connect to arousal centres.Secondly, I intend to investigate the plasticity of wake promoting pathways and ascertain whether learned as opposed to innatevalence can be integrated into this circuit. Lastly, I will address whether the arousal system has evolved in closely related yetecologically discrete fruit fly species. Fly chemosensory systems evolve rapidly and whether valence encoding during sleep has beentranslated appropriately across species borders, remains to be seen: Do different species wake to cues that are relevant to theirecology? This work promises to delve into an unexplored realm of sensory neuroscience and offer mechanistic explanations for aphenomenon that enables animals to benefit from sleep yet mitigate the challenges it poses.