I am sorry to hear that your father is unwell. If I understand you correctly, your father's complaint is leg cramps which disturbs his sleep. From your history he has chronic
kidney disease. So there are multiple factors that can possibly cause the symptoms. Electrolyte abnormalities are very common in kidney diseases which can cause cramps.
Next Steps
More detailed history and blood tests are needed to find the cause for your symptoms, in order to manage it.
Health Tips
Progressive chronic
kidney disease may require renal replacement therapy (dialysis).