The reason is that there is no one (or only a few people) in the kindergarten at night, and the yang is weak and the yin is strong. Children's yang is not strong even during the day.
Besides Yin Qi, another geomantic problem is that the sound is too noisy, that is, the sound is evil.
Solving Yin Qi is very simple. On the side near the kindergarten, just install the ever-burning lamp.
On the contrary, it is a little difficult to dissolve the sound. You can install a sound insulation board, but the effect may not be ideal.