The Sankin Kotai was a system created by Tokugawa Iemitsu in order to ensure that the daimyo under his rule would have a degree of cohesion. It was also a major pain in the neck for those daimyos, who had to plan for a major pilgrimage to Edo every other year! Moving that kind of distance every few months in the 17th century wasn't easy!
Cats are nocturnal, so they're 
actually more energetic at night.
Los gatos son nocturnos,
así que están más activos de noche.
Gatos são notívagos, então na
verdade eles têm mais energia à noite.