I have a herd of ladybirds in my bedroom. They're quite active, walking around the window, across the ceiling and sometimes on the bed. I think they're harlequins though I'm not sure, but they're certainly still feeding. I have a pot of Stevia, a herb, overwintering by the window, and was horrified to find it smothered in aphids a while ago. Then the ladybirds arrived and hey presto! no aphids. They did a similar job on my aubergines in the greenhouse last summer, dealing with a heavy infestation on 15 plants. (I like aubergines!) I know they're a threat to our natives but it's hard to complain when they help me out so efficiently.