01/08/2026
If winter leaves you feeling more exhausted than usual, it’s not just in your head. Shorter days and reduced sunlight can disrupt your circadian rhythm, the internal clock that regulates sleep, energy, and alertness. With less light exposure, your body may produce melatonin for longer periods, making mornings feel especially sluggish.
Vitamin D also plays a role. Sunlight helps your body produce it, and lower levels during winter have been linked to fatigue, low mood, and reduced muscle function. On top of that, seasonal changes in routine, heavier meals, and less movement can affect sleep quality, even if you’re spending more time resting.
The good news is there are ways to support your energy. Prioritizing morning light, even on cloudy days, can help reset your internal clock. Keeping consistent sleep and wake times, moving your body daily, and focusing on vitamin D–rich foods or supplements may also help. Small, steady habits can make a meaningful difference in how you feel all season long.
