Increasing Overnight Fluid Intake and Kidney Function During Ramadan Fasting: A Randomized Controlled Trial

•Ramadan fasting is safe for healthy people, and less safe for kidney patients.•Fasting can exacerbate kidney damage in kidney patients and transplant recipients.•People who fast during daylight hours of Ramadan often forget to drink at night.•Taking fluids at night yields normal results for kidney function as before fasting.•Fasting with no night fluid intake yields abnormal kidney function results over time.