Could just be B12 deficient. I get the sleeps when i have low B12 (also even more irritable than usual) Effects go away directly i get the jab. B12 is used for nerve stuff on the body so there might be a causal pathway there.

Using my highly rigourous studay with a sample size of 1 I therefore conclude the study shows "untreated B12 deficiency corrrlates with higher dementia risk" job done, cure found, all go back to bed!