Why Are There So Many Moth?

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Where does this thousands of flying moths came from? Maybe its 6 o clock in the afternoon when the day bids goodbye for the night is coming, lots of small moths arrived and began circling the light bulb inside our home. Thousands of them just flying and circling the light. All the bulbs were attacked by the moths. The biggest problem is how to eliminate them. Because I don't have insect repeller at that time so I just put water in small basin and tried to trap them in the water. But there were too many that even half were not caught. I put green leaves below the light to no avail. What we did was to lights off and wait till the moths transferred to other lights. After 20 minutes or so, there were few moths in the bulb. Have you experienced this?