Shikaku is an early riser and also early to bed as an adult, which was a huge adjustment considering his desire to sleep all day rivaled Shikamaru's at one point, unlike his son though he was very active and driven... as long as it was at night (HC)
Shikaku was just like me then ~ only productive at night. I feel like it was during his early jonin years where he didn’t have too many responsibilities as the jonin commander BUT he was also adjusting to the growing number of missions. he didn’t like wasting the time he spent awake whether he just couldn’t sleep or he was worked up over a mission. Unlike Shikamaru who was more than happy to stare at the ceiling and zone out. I think he has to be up early bc of his duties but everyone exhausts him and he has to go to bed in order to regain his ability to be near people.