Hidden Signs of Dehydration That Aren't Just Thirst

35. Difficulty Falling or Staying Asleep

Dehydration can be a sneaky sleep saboteur. Even a mild drop in fluid levels can disrupt the body's natural sleep-wake cycle. A lack of hydration can lead to muscle cramps (as noted) or dry mouth, both of which can cause you to wake up in the middle of the night. It can also affect the body’s ability to regulate temperature, leading to restless, uncomfortable sleep. If you find yourself tossing and turning, a glass of water before bed might be the simplest, most effective "sleep hack" you've overlooked.

36. A Drop in Blood Pressure

Dehydration reduces the volume of blood in your system, forcing your heart to work harder to pump blood. This can lead to a significant drop in blood pressure, which can cause lightheadedness, fatigue, and even fainting. While you might not have a blood pressure cuff, a feeling of lightheadedness is a clear signal that your body's circulatory system is under strain. The simple act of rehydrating can often restore your blood volume and blood pressure to normal levels.