sounds like Portugese millipedes(dark brown to black in colour)
There are a number of different kinds of small white worms. Do you find them in blankets, and other fabric? If so, they are moth larvae. If you find them in rotting meat they are fly larvae.
you have to at least describe it
Yes they have tiny tiny legs on there body and they drop poo on you every time they crawl over you
no however a snail does have a foot if you want to know things like that search google under 'mollusc'
If it has no legs it is probably a silverfish. This primitive insect looks like a tiny silver fish (1-2 cm)
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