Is it normal snail to sleep on walls?

[Snail Lover.]

Hi, My snails usually both sleep on the walls of the tank or on the roof of the tank, but i have plant pots in and bark, do they not like the stuff in the tank or do they prefer to be high up ? ( im confused ) Also they dont really go in the plant pot could they be scared of it ?
And i dont know what way to feed them , would they prefer to be hand fed ? fed on a saucer or in there tank, because the bowls they have are tiny since the snails grew so i cant put them in there and the surface of the tanks got a layer of soil, any help ? Thanks.

Renamed - CroSSLeSS

[coyote]

Sometimes mine sleep on the side of the tank, other times inside the little coconut shell house (and sometimes wrapped up in the leaves of a plant). They like variety, I guess.

I feed mine on a lettuce leaf or a leaf fallen off either my coffee tree or my lemon tree. Sometimes they nibble on the leaf too, in addition to the food I give them.

[Snail Lover.]

What leaves can they have ?

[coyote]

Ideally, the best leaves would be those of plants that grow in their native habitat that they are known to feed on (because not every native plant is necessarily non-toxic to snails).

I know coffee tree leaves and citrus tree leaves are acceptable for mine, and they are easily obtained by me as well. Beyond that, I would not want to run any risk of giving them anything that might be harmful. (Lettuce leaves, obviously, are acceptable as well.)