The most frequent meaning is of a sexual nature, especially if the dreamers are young. It also symbolizes wisdom and healing power. Seeing a sleeping snake indicates that our instinctual forces are asleep. If it wakes up and wriggles without causing fear, it reveals desires of a spiritual evolution. Dreaming of snakeskin or seeing change indicates that a profound evolutionary change is coming. If poisonous snakes appear, it indicates fear to be in embarrassing situations.
Read more about dreaming of Boa, cobra and snake in other dream meanings interpretations.