I worked for a startup from 2015 to 2017.
During that time I'd sometimes work 10-14 hours for 2-3 days in a row.
When I was tired after lunch I'd just tell my colleagues I was tired and would take a gaming break and then go play 1 or 2 maps of CS:GO in casual mode before working 5-7 hours more after the brain fog had lifted. It actually worked very well back then.
Not exactly the same as TV since was very active and not relaxing but I feel it was worth mentioning since to counter the idea that only physical exercise can work.
Later I figured out that if I just drop breakfast I don't get hit by brain fog after lunch. This is funny since every health specialist have always told how important a correct breakfast is to stay sharp during the day.
During the pandemic I tried this again but stopped it since now it seems 20 minutes of gaming just wastes 40 minutes of my day. There are some obvious between now and then but I have no clear idea which of them are responsible for why it worked back then but not now. (During the pandemic I worked from home, I also don't eat breakfast mot days and I am older now.)