I was a nanny for about 10 years as well and to be honest I was dreading what was coming when I was pg with Leah. The last family I had looked after the youngest (i looked after him from 9 weeks till 3.5yrs) didn't sleep through the night till he was 2....I used to get stories every day of how hard the evening and nights were, and when I had looked after the kids for a weekend it seemed endless.
My kids aren't like that, I don't dread that time of day, maybe cos i'm home with them so they aren't fighting for attention, I love having the sleepy cuddles and smiles as they go to bed etc. I had absoloutely no trouble bonding with either of them....it was instant love.