Lie flat on your back and use something to elevate your legs.
you should lie down on the chair because if you lie down on the floor you can get dizzy
inebriation
lie down and rest. pull to the side of the road and stop.
Your feet.
yes they can
It means to lie down flat, not collapse. And it is spelled prostrate with an 'r' in it.
Yes
The present tense spelling for "lie down" is "lie down."
Yes, Icelandair offers lie-flat seats on some of their flights.
First you lie down on your stomach on a flat surface with your arms straight out in front of your face palms down. then you lift your right arm and left foot about 1 inch off of the floor and stretch out as far as you can. then repeat with the other to limbs.
The lie-flat seats in this airline's business class are very comfortable.