Hi, I'm looking for advice on what to do with my 19 year old. She works about 20-30 hours per week in a pub, mostly evenings. Comes home and games and chats to friends all night online. She is, for the most part, considerate about keeping the noise down. My problem is she then sleeps all day, doesn't properly see daylight, then goes and does it all again. I can see it's affecting her moods. I've made gentle recommendations and explained it could lead to depression/low mood. Any suggestions what to say? I mean, she's an adult, so do I just zip it and watch her mood drop?