Sweetie, like I told you before, it's impossible to know how YOU are going to do on Zoloft. Some people report drowsiness, others report insomnia, still others report zero issues.
It doesn't matter what time of the day you start taking it, just pick morning or bedtime, and start with that. You can always adjust the dose time to help you tolerate any side effects (if you even have any), down the line.