Ever catch yourself rubbing tired eyes after a full night’s sleep, wondering why fatigue clings like morning fog? Your kidneys—those quiet powerhouses filtering your blood 24/7—might be whispering for help. Over 37 million Americans grapple with chronic kidney disease (CKD), often unaware until it’s advanced. Spotting the signs early could mean dodging dialysis, reclaiming energy for hikes or grandkid chases. Stick around; we’ll unpack nine red flags, plus simple tests that empower you to act.