Conjugations of Dormir in Spanish | Every Form Made Clear

The verb dormir changes from o to ue in many present forms and to u in the preterite, so one pattern covers most daily use.

Dormir is one of the first irregular verbs many Spanish learners meet, and it can feel slippery at first. One day it is duermo, the next it is durmió, and then it swings back to dormimos. Once you see the pattern, the verb stops feeling random.

This article lays out the forms that matter most, shows where the stem changes, and gives you clean examples you can lift straight into real speech. You will also see where dormir and dormirse split, because that little se can change the whole sentence.

Conjugations of Dormir in Spanish Across The Tenses

The core rule is short: dormir is a stem-changing -ir verb. In many present forms, the o in the stem changes to ue. In part of the simple past, that stem changes again, this time from o to u. That is the whole engine behind most of its irregular forms.

Here is the fast read on the verb:

• Present:duermo, duermes, duerme, dormimos, dormís, duermen
• Simple past:dormí, dormiste, durmió, dormimos, dormisteis, durmieron
• Present subjunctive:duerma, duermas, duerma, durmamos, durmáis, duerman

That split tells you almost everything. The stem changes when the syllable is stressed, and it stays plain in forms like nosotros and vosotros in the present. In the simple past, the change to u shows up in the third-person forms: durmió and durmieron.

Forms You Will Meet First

Start with the present tense because it carries the widest day-to-day load. If you want to say “I sleep eight hours,” you need duermo. If you want “we sleep late on Sundays,” you need dormimos. That jump from ue to plain o is the main thing learners miss.

A Small Memory Hook

Say the stressed forms out loud: duermo, duermes, duerme, duermen. Then say the pair that stays flat: dormimos, dormís. Your ear starts to hear the pattern after a few rounds, and that is often faster than staring at a chart.

The non-personal forms stay steady, which gives you a calm base. The infinitive is dormir, the gerund is durmiendo, and the participle is dormido. The RAE dictionary entry for dormir gathers those forms with the verb’s main meanings, so it is a handy place to save.

Past Forms That Trip People Up

The simple past is where many learners pause. You get dormí and dormiste, then the stem shifts to u in durmió and durmieron. That same past stem also feeds the imperfect subjunctive: durmiera or durmiese.

The imperfect is easy by comparison: dormía, dormías, dormía, dormíamos, dormíais, dormían. No stem change. If you are telling a scene in the past, this is the form for habits, background, or repeated action.

Form Or Tense	Sample With Dormir	What Changes
Infinitive	dormir	No stem change
Gerund	durmiendo	o shifts to u
Participle	dormido	No stem change
Present	duermo / dormimos	o to ue in stressed forms
Simple Past	durmió / durmieron	o to u in third person
Imperfect	dormíamos	No stem change
Will-Form	dormiré	Regular stem
Conditional	dormiría	Regular stem
Present Subjunctive	duerma / durmamos	Like present, with stem change
Command Forms	duerme, duerma, dormid, duerman	Mixed pattern by person

Where Dormir Changes Shape In Real Sentences

Charts are useful, but the verb sticks when you place it in a setting. Try these patterns:

• Yo duermo poco entre semana. — I sleep little during the week.
• Mi bebé durmió seis horas. — My baby slept for six hours.
• Nosotros dormíamos tarde en verano. — We used to sleep late in summer.
• Espero que duermas bien. — I hope you sleep well.

Each sentence puts the verb on a different track. The first is a present habit. The second is one finished action. The third paints a repeated past scene. The fourth pulls you into the subjunctive because the main clause carries hope or wish.

If you want the wider Academy pattern behind this verb, the RAE conjugation models show how irregular verbs are grouped. That helps once you notice that dormir behaves like other stem-changing -ir verbs in some tenses and then takes its own turn in the simple past.

Dormir Vs Dormirse

This pair causes more mistakes than the spelling changes. Dormir usually means “to sleep.” Dormirse often means “to fall asleep” or “to drift off.” So Duermo ocho horas means “I sleep eight hours,” while Me duermo en el sofá means “I fall asleep on the sofa.”

That difference matters in the past. Mi abuelo durmió temprano can mean he slept early. Mi abuelo se durmió temprano points to the moment he fell asleep. The RAE note on dormir and dormirse marks both uses, which is useful when you want to pin down whether the sentence is about sleep itself or the moment it begins.

Pattern	Meaning	Sample Line
dormir bien	to sleep well	Duermo bien cuando hace frío.
dormir mal	to sleep badly	Anoche dormimos mal.
dormir la siesta	to take a nap	Mi padre duerme la siesta los domingos.
dormirse tarde	to fall asleep late	Los niños se durmieron tarde.
dormirse en clase	to fall asleep in class	No te duermas en clase.
estar durmiendo	to be sleeping	La bebé está durmiendo ahora.

Commands, Subjunctive, And The Forms People Skip

The command forms follow the same logic you have already seen. For tú, the positive command is duerme. The negative is no duermas. For usted, use duerma and no duerma. If you study peninsular Spanish, add dormid for vosotros. If your target is Latin American Spanish, you can leave that form for later and still handle a huge share of real conversation.

The subjunctive often shows up after triggers like hope, doubt, or emotion: Espero que duermas bien, Dudo que duerman aquí, Me alegra que durmáis mejor. The pattern mirrors the present: stem change in the stressed forms, plain stem in nosotros and vosotros.

Common Mistakes To Drop Early

• Writing dormo instead of duermo.
• Writing dormieron instead of durmieron.
• Forgetting that dormimos can mean “we sleep” or “we slept,” depending on context.
• Mixing up dormir and dormirse in past narration.

If you want a clean study plan, learn the present first, then the simple past third-person forms, then the subjunctive. After that, most of the verb feels steady. The will-form and conditional are regular, so they tend to fall into place once your endings are solid.

A Simple Way To Memorize Dormir Without A Giant Chart

Use three anchor groups instead of one giant block of forms:

1. Present family:duermo, duermes, duerme, dormimos, dormís, duermen
2. Simple past family:dormí, dormiste, durmió, dormimos, dormisteis, durmieron
3. Subjunctive family:duerma, duermas, duerma, durmamos, durmáis, duerman

Read them aloud, then build six short lines about your own routine: when you sleep, when you slept badly, when you hope someone sleeps well, and when someone fell asleep. That pushes the forms from chart memory into active use.

Once those groups feel natural, dormir stops being the tricky verb that keeps changing shape. It becomes one of the easiest irregular verbs to spot, because the changes are patterned, not random.