Bright cool lighting (4000-6500K) is great for studying but can cause anxiety, insomnia, or negative associations if used too much at night. The American Medical Association warns that blue-rich light at night can disrupt sleep patterns. Warm lighting (2700-3000K) may be better for late-night studying to avoid messing with your sleep and to create a relaxing environment. Imagine studying late at night under bright, cool lighting and then feeling restless. Switching to warm lighting can help create a calmer atmosphere that's better for studying and winding down for sleep.