Sleeping with head down

[Fangor]

Hi, one thing occured to me, keeping blood flow in your scalp is important, right? That is one of the reasons why people massage their scalps. It is recommended to do it while your head is down (looking at ground) to increase the blood flow. One thing came to my mind...
since it is so important, could we not sleep with head down? Like, whole your body whould be on bed, but your head would be next to bed looking at the ground? And if you slept like that whole night, lets say for like 6-8 hours, that would do a lot for head. Could it not be effective?
Just curious.
And sry for my english, it is not my first language.

Oh,and btw, can you please look at my second topic and give me your opinion and advice?