On the days rated a seven (the highest level of pressure), people were 45% less likely to think creatively than they were on any of the lower-pressure days. (…)
Whatmore, more time pressure on a certain day meant less creative thinking that day, the next day, and the day after that. In other words, participants seemed to experience a “pressure hangover” that lasted a couple of days at least.
Amabile, T. M., Hadley, C. N., and Kramer, S. J. (2002). Creativity Under the Gun. Harvard Business Review 80(2): 52-61.