Why do I say this? Because you have gone through an enculturation process which focuses on hyperactivity & super high-level achievement. In training programs & in practice, admitting that you are tired or needing a rest break is a sign of weakness & is discouraged.
An increasing body of literature is demonstrating harm to psychological well-being as well as physical well-being due to sleep deprivation. Chronic sleep deprivation affects mood and job satisfaction as well as intellectual performance.