CLOCK and diabetes mellitus: Plasma noradrenaline (norepinephrine) and liver tyrosine hydroxylase levels were reduced, indicating a protective regulation of adrenergic signalling.<h4>Conclusions/interpretation</h4>Our study highlights the therapeutic potential of central overexpression of a clock gene, Bmal1, to mitigate metabolic and neurovascular deficits of type 2 diabetes, offering a compelling framework for incorporating circadian rhythms into managing diabetes and its complications.