Your blood pressure should drop by 10–20% when you sleep: Why the ‘night-time dip’ matters

Dr. Alok Chopra recently highlighted how blood pressure (BP) typically decreases by around 10% during sleep. If this 'night-time dip' fails to occur, it could elevate the risk of stroke and damage to vital organs. Sleep quality plays a crucial role in this process. Dr. Dipak Patil, a consultant cardiologist at KIMS Hospitals, explains that blood pressure normally drops between 10 to 20 percent during sleep compared to daytime levels.

This phenomenon, known as the 'night-time dip', occurs due to reduced activity of the nervous system and decreased heart effort. A non-dipping pattern, where the reduction is less than 10 percent, may indicate an impaired cardiovascular system. Even with normal daytime BP, abnormal night-time BP can lead to serious health complications such as stroke, heart disease, and kidney damage.

Factors like poor sleep quality, frequent awakenings, obstructive sleep apnoea, and heavy snoring may disrupt the normal night-time BP reduction. Addressing sleep issues and following prescribed treatments can improve blood pressure control. While a normal daytime reading provides reassurance, it does not fully capture the 24-hour BP dynamics.

Persistent sleep problems or symptoms suggestive of sleep apnoea should prompt a conversation with a healthcare professional.