I don't think this is really a health concern, but my right foot always seems to fall asleep, at least three or four times every day (as I type it is totally numb

). Earlier today I had to hop up the stairs on one foot because the numbed one "hurt" so bad that I couldn't pressure it.
What causes feet to "fall asleep"? And could it be mine always do because I constantly sit with one leg draped over the other (usually my right leg over my left) or Indian-style?
Dark Stranger