Cuando suena el despertador, me despierto enseguida.

Because cuando without an accent is used as a connector meaning when in a sentence like this:

• Cuando suena el despertador, me despierto enseguida.

Cuándo with an accent is used in questions or indirect questions:

• ¿Cuándo suena el despertador? = When does the alarm clock ring?
• No sé cuándo suena. = I don’t know when it rings.

So here, it is not asking when; it is linking two actions, so cuando is correct.

Spanish often uses the present tense to talk about habits, routines, and things that generally happen.

So:

• Cuando suena el despertador, me despierto enseguida.

means something like:

• When the alarm goes off, I wake up straight away.
• or Whenever the alarm goes off, I wake up right away.

It is not necessarily describing one single event happening right now. It can describe a repeated pattern.

This is very natural in both Spanish and English for routines.

The verb is sonar = to sound / to ring.

It is a stem-changing verb, so the o changes to ue in many forms of the present tense:

• yo sueno
• tú suenas
• él/ella suena
• nosotros sonamos
• vosotros sonáis
• ellos suenan

So suena is the correct él/ella/usted form here, because the subject is el despertador.

In Spanish, it is usually more natural to include the definite article with nouns in cases like this.

So:

• suena el despertador

literally looks like the alarm clock rings, but in English we would often say the alarm goes off or simply the alarm rings.

Spanish generally prefers the article here, especially when talking about a specific thing that is understood in context, such as your alarm clock.

Leaving out the article would sound incomplete or unnatural in this sentence.

The verb here is despertarse, which is a reflexive verb meaning to wake up.

The me shows that the action happens to yourself:

• me despierto = I wake up
• literally, something like I wake myself up

This is how Spanish normally says to wake up when talking about yourself.

Compare:

• despertar = to wake someone/something up
• despertarse = to wake up

Examples:

• Despierto a mi hermano. = I wake up my brother.
• Me despierto a las siete. = I wake up at seven.

Because despertarse comes from despertar, which is also a stem-changing verb in the present tense: e → ie.

Present tense forms:

• me despierto
• te despiertas
• se despierta
• nos despertamos
• os despertáis
• se despiertan

So despierto is the correct yo form.

This is similar to other stem-changing verbs like:

• pensar → pienso
• cerrar → cierro

In Spanish, reflexive pronouns usually go before a conjugated verb:

• me despierto
• te levantas
• se acuesta

So in this sentence, me must come before despierto.

With infinitives or gerunds, the pronoun can attach to the end:

• voy a despertarme
• estoy despertándome

But with a normal present-tense verb like despierto, it goes in front.

The comma separates the time clause from the main clause:

• Cuando suena el despertador, me despierto enseguida.

In English, we also usually use a comma when a when-clause comes first:

• When the alarm rings, I wake up right away.

If you reverse the order, the comma is often not needed:

• Me despierto enseguida cuando suena el despertador.

Both orders are possible, though the original version may sound slightly more structured or natural in this context.

Yes, that is grammatically correct.

Both versions work:

• Cuando suena el despertador, me despierto enseguida.
• Me despierto enseguida cuando suena el despertador.

The difference is mainly one of focus and style:

• Starting with cuando suena el despertador puts the time/event first.
• Starting with me despierto enseguida emphasizes your reaction first.

The original sentence is very natural and common.

Because this sentence describes a habitual or general situation: whenever the alarm rings, I wake up right away.

With cuando, Spanish uses:

• indicative for things that are habitual, repeated, or viewed as real
• subjunctive for future or not-yet-real situations in certain contexts

Here:

• Cuando suena el despertador, me despierto enseguida.

This is a routine, so suena is in the indicative.

Compare with a future idea:

• Cuando suene el despertador, me despertaré.

That means When the alarm rings (in the future), I’ll wake up.

So the original sentence uses the indicative because it is talking about what normally happens.

Enseguida means right away, straight away, or immediately/very soon, depending on context.

In this sentence:

• me despierto enseguida

it means:

• I wake up right away
• I wake up straight away

It is a very common word in everyday Spanish.

Depending on context, enseguida can sometimes mean in a moment or very soon, but here it clearly means an immediate reaction to the alarm.

They are close in meaning, but enseguida is usually more common and more natural in everyday speech.

Compare:

• me despierto enseguida
• me despierto inmediatamente

Both are correct, but:

• enseguida sounds more conversational
• inmediatamente sounds a bit more formal or emphatic

In normal spoken Spanish, especially in simple everyday situations, enseguida is very common.

Not exactly.

• despertarse = to wake up
• levantarse = to get up / to rise from bed

So:

• me despierto means your eyes open / you become awake
• me levanto means you physically get out of bed

These are related, but they are not the same action.

For example:

• Cuando suena el despertador, me despierto enseguida, pero no me levanto hasta las siete y media.
• When the alarm rings, I wake up right away, but I don’t get up until 7:30.

A useful approximate pronunciation for a native English speaker is:

• despierto ≈ dess-PYER-toh
• despertador ≈ dess-pehr-tah-DOR

A few helpful points for Spain Spanish:

• r is tapped in despierto
• the d between vowels is softer than in English
• the final r in despertador is not pronounced like an English r
• vowels are pure and short: e, a, o do not glide like English vowels often do

Also notice the stress:

• desPIERto
• despertaDOR

Yes. El despertador literally means alarm clock, but in many contexts it is naturally understood as the alarm.

So:

• Cuando suena el despertador...

can be translated naturally as:

• When the alarm goes off...
• When the alarm rings...

Even though the Spanish word is literally the device, the natural English translation may focus on the alarm sound rather than the physical clock.