My just turned 2 year old has suddenly been waking up screaming in the middle of the night. Nothing is wrong - she stops the minute you go in. However the past 2 nights she's been up for 2 hours in our bed. Lights off no talking but she will not sleep!! Should I just ignore her and leave her in crib? That's sort of what I want to do but i still won't get any sleep if she screams for 2 hours