You know that sudden burst of energy and restlessness that hits when the sun starts to stick around a bit longer? It turns out 'spring fever' isn't just a figment of your imagination or an old wives' tale; it’s a physiological reality. As daylight increases, our bodies produce less melatonin, the sleep hormone, and ramp up serotonin levels, effectively waking us from our winter hibernation mode. This chemical shift often leads to heightened mood, more energy, and yes, that classic restlessness that makes you want to fling open the windows and start something new.