yeah, it happens to me quite a lot. sort of feels like my toes are stuck through a (non existent) hole in my sock. i get numb fingers too from time to time, mostly my little finger and ring finger on my right hand. my mum gets carpal tunnel, don't know if that has anything to do with it. but nothing's dropped off yet so i assume it's ok!
You should see your GP to be on the safe side. Numbness can be symptomatic of many things, some harmless, others serious. Better to err on the side of caution.