Common Evening Brown

Loll! I think their name derives from the time they fly in the natural environment, dusk. The reason they are observed inside houses is that they are often attracted by lights. So, they sometimes come inside the house at the night and stay there until the next morning till the lights go off. This particular one was still inside in the middle of the day. I thought it couldn't find its way out, so I helped it find its way. It disappeared soon after it saw daylight, and I never found it again.