Fastest way to get your foot/leg 'awake' from falling asleep?

I'm a rather short person, so I sit on my legs when I'm in a desk or such, and my feet fall asleep often. How do you get rid of it?Fastest way to get your foot/leg 'awake' from falling asleep?
shake it, dont put pressure on the nerves in your elow or knee
I think that you might be pinching a nerve in your lower back..
I think that I would check with a doctor, or, ask your school nurse.
Slowly get up and take a walk outside (normally works for me)