In “Cosmic”, Liam, the main character, reads a book called Talk To Your Teen, which is about getting to appreciate your teen, setting limits, and being a good parent. I think that it should have included something about bedtime. Bedtime is a big issue, because sometimes the bedtime is a limit on reading time, or it is letting teens stay up too late, and therefore not get enough sleep. Parents usually overestimate the time that children need to sleep, and children underestimate it. This is good, because usually somewhere in between is the most reasonable bedtime, unless the parent or teen is very irrational. During this time, teens need about 9-10.5 hours of sleep to function properly. A nine-o’clock bedtime is reasonable if you need to get up early if you live far from school, and a nine-thirty bedtime if you can get up later. Any later than that is unreasonable and unhealthy, and any earlier is a limit on your teen’s time. This is what I would add to “Talk To Your Teen”.