A short overtime sprint won't kill you but, as data from World War One shows, consistently putting in too many hours at work hurts employees and employers.
When will this overwork culture die? It should be obvious that tired, overworked humans are not more productive than calm, well rested ones.
We can always push ourselves to do more – or so the thinking goes. Long work hours and demands outside of working hours are imposed upon employees by management and are usually a part of a workplace or professional culture.
Can you imagine Olympic athletes working at full throttle right up to their events on hardly any sleep?! It doesn't make an ounce of sense.
Work hard by all means, but rest appropriately as well.