My child is 13 months and the only way to put her to sleep is by sleeping alongside with her, every single time. Only when she's fast a sleep I can go away. It usually takes about 30min for her to fall a sleep. It's driving me mad every night having to stay in bed till she falls a sleep. She always been very difficult to put to bed, in the beginning I used to have to go for a walk outside untill this system started but I want to be sure I'm doing the right thing. How can I teach her to fall a sleep by herself?