The night-time TACO rate was higher than the daytime rate. As with cardiogenic acute pulmonary edema and other cardio- and cerebro-vascular conditions which are more frequent at night, this may involve biological clocks, external stressors (e.g. recumbency and transfusion), and individual risk factors. This is yet another reason to avoid overnight transfusions unless urgently needed.
Badami et al. (Mon,) studied this question.