I’m not fully sure what you mean by “why night extinguished.”

Do you want to ask:

• Why Jains extinguish lamps / fire at night?
• Why some Jains avoid eating after sunset (night food is “extinguished” / stopped)?
• Or something else related to “night” in Jainism?

If you tell me which one you mean, I can explain it clearly in a Jain-dharma way.