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.