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Diurnal variation in urine volume, creatinine clearance (Ccrea), and sodium excretion (Na+/crea) in patients with severe autonomic failure due to multiple‐system atrophy (MSA) and pure autonomic failure (PAF) (day: 8 a.m. to 8 p.m.; night: 8 p.m. to 8 a.m.). Ccrea was similar during the day and during the night. The urine volume and urinary sodium excretion were approximately two‐fold greater during the night than during the day. *p<0.05; **p<0.01
