Remember that acostarse is a stem-changing verb, so we use the stem acuest- in all forms, except for nosotros/as and vosotros/as.

Do reflexive verbs have accents?

When the reflexive verb is used in a progressive tense, the reflexive pronoun is attached to the end of the present participle (gerund) or placed before the conjugated verb. When it is attached to the gerund, an accent mark is required. Both forms are accepted.

Where is the accent in Vosotros for verbs?

When we conjugate a verb in the vosotros form in the present tense there is very often a written accent on the last syllable. It also happens in the future tense. This is because we always put the stress on the last syllable when conjugating the vosotros form in these tenses.