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Sleeptax Error.

By comparing the two groups of participants, we found that a single night of sleep deprivation leads to a reduction of 50% in the quality of the implementations. There is important evidence that the developers' engagement and their prowess to apply TFD are negatively impacted. Our results also show that sleep-deprived developers make more fixes to syntactic mistakes in the source code.

Davide Fucci, Giuseppe Scanniello, Simone Romano, Natalia Juristo: Need for Sleep: the Impact of a Night of Sleep Deprivation on Novice Developers' Performance