Sleep Facts02/16/2026Although we’re having warmer weather and spring is coming soon, did you know that studies show that 34% to 51% of Americans report sleeping more as the weather gets colder? Lutheran Health Network says that a decrease in exercise, lack of sunlight, and mood changes explain why we’re so tired during the winter. If you find yourself experiencing winter fatigue, Lutheran says you can increase physical activity and exposure to light, check your vitamin levels, and get cognitive therapy.