What to do?

My mind has been in almost constant turmoil for the past few days. Cindy, the morning girl on CFCO is leaving at the end of the month, and now her position has to be filled either by Lisa, me or someone from outside. Lisa's done the shift before and hates it with a passion, and rumour has it the job is mine if I want it. The thing is, I'm not entirely sure I do! I mean, it would be a great career move, *possibly* more money, and it is the best shift a news person can get around here. But it means getting up at 2:30 every morning, being tired all the time, never being able to do anything in the evenings during the week, and everyone who's done that shift leaves because it's too stressful. Cindy's got ulcers, Lisa was addictedto sleeping and caffeine pills...what the hell's going to happen to me?? I hate not knowing. I wish my boss would just say Ok Robyn, here's what you're going to do and leave it at that.