If this is the first time this has happened, I wouldn't be too worried. If it continues or happens with other parts of you, I'd recommend you see a doctor.
It's probably just an aggravated nerve, but it could also indicate a B12 deficiency, or a larger neurological problem. That's why I say if it gets worse you should get a doc to check you out.
I'm not a doctor or anything - I've just got a few neurologic problems myself so I'm just telling you what I know. Hope you little toe just stops falling asleep on its own!
