I can third this. Stupidly let myself get not so much dehydrated, but had sweat enough to alter electrolyte balances. I had been drinking plain water, and hadn’t eaten for at least a few hours.
I got back to my car, turned the air conditioning up to max thinking that the tiredness was due to overheating, and started to eat a bit of beef jerky. I swear I could feel the salt permeating everything (the “almost orgasmic” feeling), and within 5 min or so, felt my normal self again.
So, now when hiking in so. cal summers, I have a tube of electrolyte tabs meant for those camelbak water reservoirs, that I can pop into my nalgene if I even start to feel that way.
