Do High Frequency Trading Bots operate at evening and pre-market?

If trading bots do not sleep or eat, how come pre/after trading markets are not the same as day time?

 

Not enough volume for serious bots, but piker bots still run

 

Giant trading bots come out at nights only when there's blood in the streets

 

What is a piker bot?

 

Jk
https://www.merriam-webster.com/dictionary/piker

 

profits after hours are much less as there is less human meat. Market makers simply widen their spreads to compensate for the risk vs income.

 

As far as I know, the profits made after hours are much less than the normal hours.