Does every child doesn't have enough hours of nap will cry at night? My LO15mo from 7mo onwards every day when she fall asleep she wld suddenly woke up crying & screaming, so we suspect she didn't had enough napping time (light sleeper). Until now she wld still woke up crying & uncontrollable certain days.

If your daughter is a light sleeper, maybe you can try to optimize her sleeping time by making her sleeping environment as conducive as possible. Locate her as far away from any disruptions and noise as possible. Ensure that her room is dimmed and that she has just enough time to nap. If she sleeps too much in the day, she might not get enough sleep at night.