Had an older gentleman sit next to me doing exactly this when I flew to São Paulo. 10 hour flight, jeans, dress shoes, button up shirt, didn’t read, only had coffee even with there being 2 meals provided in air, I don’t think he even slept. This was a red eye flight, this man stared at the turned off in flight entertainment screen the entire time.
Either you sat on the other side of this man, OP, or he’s done this more than once.
Had an older gentleman sit next to me doing exactly this when I flew to São Paulo. 10 hour flight, jeans, dress shoes, button up shirt, didn’t read, only had coffee even with there being 2 meals provided in air, I don’t think he even slept. This was a red eye flight, this man stared at the turned off in flight entertainment screen the entire time.
Either you sat on the other side of this man, OP, or he’s done this more than once.