True, BusyMum - You don't sound sourpuss at all, I'm afraid I don't know about the little one sleep-deprivation yet.
I've actually cheated and spent a small fortune on a little computer thing that tells me what to do! ie alarm goes off on it, take temp, and a light comes on telling me whether its safe or not. Green means GO!!! you're infertile, red means STOP!!! about to/actually ovulating, and yellow is learning, so be careful. When we are ready to start our family, BD on the red days instead! It was a major investment though, and although it should pay for itself over time (lasts over 10 years), it's not for everyone.
All the best deciding which contraception to use!