You don’t have to literally poke yourself (though it’s fun). Just take a mental inventory: Are you feeling a dull headache coming on? Did you just yawn for the tenth time this hour? Fatigue and headaches are two of the earliest signs of mild dehydration.
Your brain is roughly 75% water, so when it gets low, it starts throwing a tiny tantrum. Before you reach for coffee or painkillers, drink a tall glass of water and wait 15 minutes. You might just have fixed your day.
