Not quite. What you wrote is the
negated present indicative form.
What you wanted is the
negative imperative form.
Here are the forms used:
Present Indicative
tú
vos
vosotros
|
(no) te acuestas
(no) te acostás
(no) os acostáis
|
Present Subjunctive
tú
vos
vosotros
|
(no) te acuestes
(no) te acostés
(no) os acostéis
|
Affirmative Imperative
tú
vos
vosotros
|
acuéstate
acostate
acostaos
|
Negative Imperative
tú
vos
vosotros
|
no te acuestes
no te acostés
no os acostéis
|
Edit: Additional note for the
voseo negative imperative:
What I wrote is not used in Argentina, Paraguay and Uruguay. It is used in Central America. In the aforementioned countries, they apparently use the
tuteo form in the subjunctive and negative imperative (they still use the
vos pronoun, however).
So, expect to hear
no te acuestes in Argentina, Paraquay and Uruguay for the
voseo negative imperative.