Hard 21m old :-(

[Heres Hoping]

Hi just noticed this thread, had already made one of my own about a very difficult 20 month old. Theres a few months diff in age but this thread sounds v familiar already did anyone experience difficulties with sleeping? As I said in my own thread my girl has suddenly stopped sleeping or napping and is crying and screaming when put to bed. It seems to be out of pure temper, shes even bit herself in these tantrums as ive seen little teeth marks. Did anyone experience the same? Im expecting no. 2 in a months time and already shitting myself