I have quit crystal meth for 3 days and slept the whole time now my legs are numb but no pain...why?

Congratulations: Firstly, congratulations. Crystal meth is a very very nasty drug that I see in my patients far too often here in Ft. Lauderdale. Sleeping long periods is not uncommon after stopping the amphetamine. Nerve damage can occur..both at a central and peripheral level. I am going to guess that your issue was the way you were sleeping for the past 72 hours. If this doesn't resolve..see you PCP.