Why Eczema worsens at night?

There is a difference in the biological cycle of the body during the day and night times. During night-time, there is an increase in blood flow and body temperature which warms the skin. Warm skin can cause you to itch more. Another reason is that during daytime the itching sensation gets distracted by other activities that keep you busy. Whereas in the night there is no distraction. Also, the effect of moisturizer applied during the daytime withers by the night.