or

When we go out of bed on a very cold morning, we feel cold but when we come back to the same room after strolling in the open air we feel warm. Why?

We all know that, the temperature of our body higher in the bedroom than the temp. of surrounding. So, when we go outside, our body loses the heat and we feel cold.

After strolling outside in open air the temp of our body again decreases below the temp. of bedroom. So, when we come back to the bedroom, our body gains heat and we feel warm.