Your sentence
Es+importante+que+duermas+bien.
Words in this sentence
que
that; than; indicates reason; because, for; used to form sentences with an optative meaning; may; indicates emphasis or repetitive answer
Conjunction
dormir
to sleep; to fall asleep; to sleep in; to die; to rest in death; to put to sleep (someone or something); to anesthetize; to euthanize, to put down (mainly for pets but also people)
Verb
bien
well (adverbial form of bueno); well; fine; okay (state of being satisfied with the status quo); properly; willingly; very; as well
Adverb