of course living people, and constantly work without rest is very bad, and for the physical and moral condition,and if a person is tired-he makes a lot of mistakes-that is not good
My opinion is that you dont need to put pressure on the developers and constantly remind them of the deadlines ... they are interested in releasing their product as soon as possible.
I do not put pressure on the team,I'm just for the developers to have a rest physically and mentally from the project and gain strength