Probably an odd question but is there anything one can do to mitigate side effects on training from sleep restriction other than getting more sleep and focusing on improving sleep hygiene?
No, though there may not be any side effects at all that you’ll notice.
Obviously not expecting a magic bullet from creatine, but what do you make of this and similar studies? Effect of creatine supplementation and sleep deprivation, with mild exercise, on cognitive and psychomotor performance, mood state, and plasma concentrations of catecholamines and cortisol - PubMed