My different BP readings

I noticed that my Blood Pressure readings at night usually differ from those during the daytime. Kindly help to explain why this is happening.

Salami (by SMS)

Blood pressure (BP) varies according to many internal and external factors, and behavioural factors have an important role in diurnal BP variation. BP rises sharply on waking in the morning and falls during sleep at night, although it varies throughout the day and night.

These changes in BP are closely related to mental and physical activities, and the sympathetic nervous system mainly contributes to the diurnal variation in BP. Other behavioural factors, such as food consumption and obesity, dietary intake of sodium, drinking and smoking habits, consumption of coffee and tea, and bathing, also affect the diurnal variation in BP.

Alterations in diurnal BP variation due to behavioural factors are frequently seen in patients with hypertension and can be classified as morning hypertension, daytime hypertension and night-time hypertension. Appropriate lifestyle modifications may normalize or improve both the level and rhythm of BP in these patients.”

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