I just dont know what to do. Last night my 4m.o. DD fell asleep at 8pm, tonight she was getting really manic and hyper at 10pm so we put her to bed,then she got really upset and wouldn't sleep. Other nights it can be anywhere between 8 and midnight and she might wake up and stay awake after 2hours, or sleep waking up just for feeds till the next morning. She co sleeps with us and i breast feed. It's making me quite tired and sometimes very stressed out. I dont know if to try to put her to bed at the same time every night, is a routine important at 4m.o? Do babies need routine, do they know what time it is? Should i put her to bed as soon as she starts to get manic? Sorry for long post and questions, i dont know who else to ask..