I sometimes solve mathematical problems while dreaming — not usually a very clear minded state. Also, how clear the mind is has a lot do with setting. I don't d

I sometimes solve mathematical problems while dreaming — not usually a very clear minded state. Also, how clear the mind is has a lot do with setting. I don't drink alcohol, so I've often been in party places sober. However, while I in that setting my head is as foggy as a sauna. I can easily imagine the opposite, being 'high' in a setting which allows focussing on a difficult problem.