Science offers a more straightforward explanation. Between 3:00 a.m. and 5:00 a.m., the body reaches its lowest point in terms of temperature, heart rate, and metabolic activity due to natural circadian rhythms. Hormone levels shift and the body begins preparing to wake up later in the morning. Because everything slows down so dramatically, even small disturbances—like stress, thirst, noise, late-night eating, or changes in blood sugar—can trigger an awakening. People who are experiencing ongoing stress or emotional strain may be especially sensitive during this time, sometimes waking with racing thoughts or difficulty relaxing again.
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