Objective: The home blood pressure monitoring (HBPM) method that measures blood pressure during sleep hours was reported to be comparable to ambulatory blood pressure monitoring (ABPM) in measuring night-time blood pressure and detecting nocturnal hypertension. The aim of this study was to directly compare the prognostic power of nocturnal hypertension detected by HBPM versus ABPM for predicting future cardiovascular events. Design and method: We analyzed night-time blood pressure (measured by HBPM and ABPM) data of 1005 participants who were included in the Japan Morning Surge-Home Blood Pressure (J-HOP) study. Results: During a follow-up period of 7.6 ± 3.4 years, 80 cardiovascular disease events occurred. The majority (91.8%) of our study population were hypertensive and 80.7% participants were using antihypertensive medication. Night-time home systolic blood pressure (SBP) was higher compared to night-time ambulatory SBP (123.0 ± 14.6 versus 120.3 ± 14.4, p < 0.001). Nocturnal hypertension was defined as night-time home or ambulatory SBP of 120 mmHg or more. The number of participants with nocturnal hypertension defined by HBPM and ABPM was 564 (56.1%) and 469 (46.7%), respectively. Nocturnal hypertension defined by HBPM was associated with increased risk of future cardiovascular events; total cardiovascular events (coronary artery disease and stroke events) [1.83 (1.00; 3.37)] and stroke [2.87 (1.17; 7.03)], independent of office SBP and night-time ambulatory SBP. These results were absent with nocturnal hypertension defined by ABPM. Conclusions: This is the first comparison prospective study illustrating that uncontrolled nocturnal hypertension defined by HBPM (independent of office SBP and night-time ambulatory SBP) is a predictor of future cardiovascular events.