I have to agree, it bothers me every year, but I take a high dose vitamin d supplement, make sure I get out for an hour at least at lunchtime, also bought a wake up light alarm which helps in the mornings

Basically every westerner has a vitamin D deficiency, as we don't spend all day long outside anymore.

So go get some D prescribed, because deficiency accelerates dementia and a whole slew of mental disorders.

You could spend lots of time in the sun to alleviate the D vitamine deficiency but that'll get you skin cancer instead.