Why do you think that book Go the F*** to Sleep is so popular? It is because kids that won't go to sleep are just infuriating!! I have been there many times before, it makes you irrationally angry when all you want to do is have a bit of downtime after they are in bed but instead there you are an hour or two later still trying to get the little darling to go to sleep. That doesn't make you a bad parent, just human. I know I have yelled at my kids more than once ('cos yelling at them will settle them to sleep faster lol).

Just remember, this too shall pass