Why did Imam Khomeini not encourage his grandson to perform midnight prayers?

Imam's quiet companion and pleasant companionship

Ahmad Khomeini had great virtues, sacrificed himself for Imam

Source: Ambassador of the Imam and the Revolution (Memoirs of Hojjat al-Islam and Muslims Seyyed Ali Akbar Mohtashamipour)

Imam Khomeini called for the boycott of Israel in 1967?

A memoirs and statement by the supreme leader

Imam never gave up mid-night prayers even during exile, tough times

A memoir by Hujjatal Islam Haj Ahmed Agha Khomeini – Imam's son

Imam attached great significance to reciting holy Quran.

A memoirs by Hujjat al-Islam Aashtiyani

Imam advised young people to attach value to their youth and worship God

A memoirs by Ayatollah Tawasulli

Imam gave great importance to listening to the news.

A memoir by Hujjatal Islam Ashtiyani