Things that affect thought

I have noticed that there are certain things that affect thought for me and therefore affect how I write or if I write.  1) alcohol makes me dumb for a few days 2) time of day and my new addition is 3) physical work.  I suspect that physical work depletes neurotransmitters. On less labor intensive days I think more abstractly.  Or is it depleting my writings from other outlets?  I'm not sure.