Is floppiness after legs falling asleep a sign of a nerve condition?

Legs/arms falling: Asleep are from pressure on nerves or decreased blood flow, in that order. Numbness and tingling from nerve pressure is common during sleep when we don't move much. The numbness etc is temporary malfunction of the sensory part of the nerve. Temporary floppieness is a malfunction of the signals sent from the spine to the muscles. As long as its temporary, it's normal.