Unravelling the cellular mechanisms underlying sleep oscillations

Every night, a tiny cluster of neurons in the fruit fly brain begins to pulse with slow, rhythmic waves of electrical activity—the same kind of slow-wave oscillation that marks deep sleep in humans. This matters because scientists know that these oscillations signal a growing need for sleep, but they do not understand how brain cells actually *generate* them. The missing link appears to be inside the cell: mitochondria, the energy factories, seem to sense when the cell’s energy supply is out of balance with demand, and then trigger calcium waves that drive the slow oscillations. This project will use fruit flies to watch that process unfold in a single neuron, combining genetics, physiology, and behaviour to trace the chain from mitochondrial metabolism to the electrical rhythm. If the research succeeds, it will reveal a fundamental mechanism linking cellular energy status to sleep regulation. This is primarily curiosity-driven fundamental science with no immediate practical application. However, understanding how mitochondria drive sleep oscillations could eventually clarify why sleep restores the brain at a cellular level—and what goes wrong when it does not, in conditions from fatigue to neurodegeneration.