Why do people tell you to do this if your light-headed? What does it do?

Question

I got light-headed during a dissection due to my medications and the fact that the room was pretty warm. The Dr (DVM, actually) told me to sit with my head bewteen my knees. Why do you do that? What helps it?

Answer 1

It helps return blood-flow to your head with oxygen...
Vasovagal syncope, or fainting, results from a neurological reflex that originates in the brain. In response to a physical or emotional trigger, the brain emits signals that cause blood vessels to dilate and causes blood to pool in the legs. The heart rate also slows. Subsequently, the brain does not receive enough oxygen-carrying blood, leading to fainting.
"A combination of leg crossing and muscle tensing may help prevent fainting, providing a simple solution for people prone to fainting during emotional stress or prolonged standing, researchers report in today’s rapid access issue of Circulation: Journal of the American Heart Association".
*Make sure you stay hydrated & drink lots of water, this can also contribute to fainting spells (especially when it's hot).

Answer 2

the lower your head is the easier it is for blood to flow to your head. if you stand on your head you can get the reverse -- light headed from too much blood going to your head

Answer 3

i don't know bout i was told that i think it get it out or something like that