Useful advice on duties of a King

Some useful advice from Chāṇakya in his Arthashastra (Book 1, Chapter 19):

First 1½ hrs. after sunset Interview with secret agents
Second 1½ hrs. after sunset Personal: bath, meals, study
Third & Fourth 1½ hrs. after sunset and First 1½ hrs. after midnight Retire to the bed chamber to the sound of music, sleep
Second 1½ hrs. after midnight After waking to the sound of music, meditate on political matters and on work to be done

Developed in the period around 300BC when the Maurya Empire was active, and Chāṇakya was advisor to its first emperor, Chandragupta.