Answer:
The decrease in systolic blood pressure following reduced sleep might be due to a number of factors, including:
1. Dehydration: If you're not drinking enough fluids or if you're losing fluids (through sweating, for example) during the night, your blood volume could be affected, leading to a temporary drop in blood pressure.
2. Fatigue: The stress associated with sleep deprivation could cause your body to produce more adrenaline, which might lead to a temporary drop in blood pressure as your body tries to conserve energy.
3. Parasympathetic activation: Sleep deprivation may cause an increase in the activity of the parasympathetic nervous system, which tends to lower heart rate and blood pressure.
4. Individual variations: Your body's response to sleep deprivation might simply be unique to you. There is considerable variability in how people's blood pressure responds to changes in sleep patterns.
It is important to remember that these explanations are general and speculative. If you have concerns about your blood pressure or the effects of your sleep patterns, it is important to consult a healthcare professional for personalized advice.