My DD (2 years old) used to settle when put to bed at 7.30pm and talk to herself until 8pm before going to sleep. Recently she has started yelling continuously until about 9.30pm. She is in a cot bed and we haven't taken the sides off yet. We go in periodically and try to do controlled crying but I'm worried that she is going to start staying up until 9.30pm all the time and what will happen when she's in a bed and can get out! Is this normal for 2 years old? How can I get her to go to sleep earlier?