I try and schedule my "collaboration" time then because conversation helps, and a lot of times it's not entirely work related. For real though my focus is gone until later at night by this point, so it is what it is. My coworkers and managers are fine with it.

Wake up slow then eat a huge breakfast. That gives me plenty of energy for the day, then my lunch can be smaller.

limit my caffeine in the morning

Eat less and drink more water

I start some easy task so I'm distracted from that im tired. Then it flows from there.

Coke Zero hits the spot for me

My lunch is usually a can of Monster and a handful of Ibuprofen, but I'm under no illusion that doing so isn't slowly killing me, so probably don't follow my lead here.

I usually eat lunch in about 10-15 minutes during a meeting so I don’t have a choice to slow down and get sleepy. That kicks in later on the drive home.

Most people (that can get away with it) basically just check out after lunch. In a 9-5 job the majority of work happens in the window of 10-12.