my 8 months old daughter resists putting to sleep at night. even though she can go to sleep herself during the day, we have a hard time putting her to sleep at night. she will not sleep by herself and will cry. however, she will sleep within a matter of 15-20 mins, but until then, it is very difficult to contain her. we have tried putting her to sleep any time after 10.30 pm, every time we have the same problem. pls suggest a resolution. thanks.