New research sheds light on why it feels harder to wake up in cold winter mornings

Scientists have discovered a neuronal circuit in flies that acts like a thermometer, inhibiting neurons responsible for alertness, especially in the morning. Researchers from Northwestern University found that receptors in the fly's antennas respond to temperatures below 25°C (77°F). These receptors communicate with brain neurons that regulate wakefulness and sleep rhythms. When external temperatures drop, neurons usually activated by morning light are suppressed, affecting the fly's alertness.

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