The word that ends in "ant" and means sleeping is "recreant." It refers to someone who is cowardly or unfaithful.
ignorant
One example of a word that ends in "ant" and can turn to "ance" is "abundant," which can become "abundance."
Chindi (Hindi word)
"Pismire" is an archaic word for ant. It comes from the Middle English word "pismire," which originated from the Old English words "pise" (ant) and "mēre" (ant).
The word that ends in "ant" and means sleeping is "recreant." It refers to someone who is cowardly or unfaithful.
dormant
brilliant
Luxuriant.
observant
Distant
ignorant
Instant
Stagnant
One of the many examples of a word that ends with the suffix, -ant, would be chant.
The word you are looking for is infant. Infant means small child.
The word you are looking for is "important."