The study will evaluate the safety and efficacy of melatonin supplementation in CKD and ESRD patients with sleep disorders to reduce sleep latency times, the number of apnea/hypopneic episodes, and prolong duration in rapid eye movement (REM) sleep in CKD and ESRD patients with sleep disordered breathing.

The study will look at the safety and efficacy of melatonin supplementation given to patients with chronic kidney disease and end stage renal disease who have sleep disorders to reduce sleep latency times, the number of apnea/hypopneic episodes, and prolong duration in rapid eye movement (REM) sleep in CKD and ESRD patients with sleep disordered breathing.

Inclusion Criteria:

1. Patient age > 18 and <85 years of age
2. Patients with CKD or ESRD with eGFR < 30 mls/min
3. If receiving hemodialysis, patients must be on treatment > 3 months
4. Normal healthy controls must be without a known history of CKD and be willing to have formal PSG test and plasma melatonin measurements

Exclusion Criteria:

1. Patients receiving outpatient hemodialysis for < 3 months
2. Patients with estimated GFR by Cockcroft Gault > 30 mls/min
3. Patients receiving beta blocker therapy within one month of randomization
4. Patients receiving Nifedipine therapy within one month randomization
5. Patients on peritoneal dialysis
6. Patient with chronic home oxygen supplementation
7. Patients receiving chronic home CPAP therapy
8. Patients actively receiving outpatient sleep medications
9. Patients with diabetic gastroparesis unresponsive to medication
10. Patients with known pregnancy or unwilling to use contraception during the course of the study
11. Patients with a functioning renal allograft
12. Patient currently receiving long-term immunosuppressive therapy. Patients receiving low dose prednisone (10mg or less per day) will not be excluded from this trial
13. Unable to give informed consent