Are You Dehydrated? Signs You're Not Drinking Enough Water

You feel fatigued and lethargic

As we just mentioned, when a body is dehydrated it "borrows" water from your blood. A lack of properly hydrated blood leads to a lack of oxygen being brought throughout the body. Of course, a lack of oxygen leads to sleepiness and outright fatigue. A lack of stamina means you’ll start to experience that 2pm crash earlier and earlier in your day (and remember, coffee won’t help in the long run).