Khalifah Umar ibn ‘Abdul ‘Aziz rahimahullah wrote the following instructions to his children’s mentor (teacher)
Be strict on them for this is more effective in restraining them. Stop them sleeping after Fajr Salah, for this cause stupidity/negligence. They should laugh less for a lot of laughing kills the heart/soul. Let the first thing you inculcate in them be the hatred for music, for I have heard from various People of Knowledge (‘Ulamaa) that music develops hypocrisy in the heart just as water grows grass.
Each of them should commence the day with the recitation of the Holy Qur’an in the proper manner. When they complete that, they should take their bows and arrows and proceed barefooted to the range. Each of them should shoot 7 times. Thereafter they should take mid-day sleep (siesta). For Sayyiduna ‘Abdullah ibn Mas’ood radiallahu’anhu use to say: Oh my children! Take siesta, for verily the devils do not do so.
[Kitabu Zhammil Malahi of Hafiz Ibn abi Dunya pg. 9]