You know when you suddenly stand up after lying down/sitting down for a long time, you might get a dizzy feeling and feel like falling or fainting or you can’t stand up straight?
Sigh. it happens all the time to me, but i fell down from it today =( I was holding my mom’s iphone summore! my mum and sis just stared at me and thought why i decided to just lie down on the floor (as if that’s such a regular occurrence eh!!!!!!! k la maybe i do just suddenly fall on the floor for fun sometimes T_T) until i told them i can’t move
only a few seconds, though, don’t worry about it 
According to Google and its incredible powers:
“Sometimes when I stand up after I’ve been sitting or lying down for awhile, I get dizzy and feel like I’m about to black out. What causes this?
Well, when you stand up, the normal pull of Earth’s gravity causes blood to pool in your legs. The veins there stretch out slightly, and rather than fighting against gravity to get back to your heart, a significant amount of blood just stays in the newly expanded veins. Less blood is available to circulate, blood pressure drops, and less blood is pumped to the brain.
Your body restores normal circulation with a pressure receptor in the major artery leading to the brain. It senses the drop in blood pressure and sparks a reflex response that speeds up your heart rate and constricts your blood vessels – so that your blood pressure returns back to normal. It’s just that sometimes this response doesn’t kick in immediately – especially if you’re hungry, hot, or tired. And that’s when – if you stand up suddenly – you might feel like you’re on the verge of blacking out. This might make you feel as though your body wants to fall down. If so, it’s because it’s easier for your blood to flow when you’re no longer standing.”
Apparently i’m so lazy i’m reduced to cut and paste. Cheers!
