Mi amigo tiene sueño después de viajar.

Tener sueño is the most common everyday way to say to be sleepy in Spanish.

It uses tener + noun, which is very common in Spanish for physical states:

• tener hambre = to be hungry
• tener sed = to be thirsty
• tener sueño = to be sleepy

So even though English uses to be, Spanish often uses to have in these expressions.

• es soñoliento means he is sleepy by nature or he tends to be sleepy, which sounds more like a personality/characteristic.
• está con sueño is understandable in some regions, but tiene sueño is much more standard and common.

Yes. Sueño can mean either:

• sleepiness / sleep
• dream

The meaning depends on context.

In tiene sueño, it means sleepiness or feeling sleepy.

Examples:

• Tengo sueño. = I’m sleepy.
• Tuve un sueño extraño. = I had a strange dream.

So the phrase tener sueño is a fixed expression, and in that expression sueño does not mean dream.

Because tener sueño is an idiomatic expression.

With expressions like this, Spanish usually does not use an article:

• tener hambre
• tener sed
• tener frío
• tener miedo
• tener sueño

If you say tiene un sueño, that usually means he has a dream. If you say tiene el sueño, it would only work in a more specific context, such as referring to a particular kind of sleep or dream already mentioned.

So for he is sleepy, the normal form is simply tiene sueño.

Because después normally needs the preposition de before a noun or an infinitive.

So you say:

• después de comer = after eating
• después de estudiar = after studying
• después de viajar = after traveling

Without de, it sounds incomplete.

A useful pattern is:

después de + noun / infinitive

Examples:

• después de la clase
• después del trabajo
• después de descansar

In Spanish, after a preposition like de, verbs usually stay in the infinitive.

So:

• después de viajar
• antes de salir
• sin comer

This is similar to English after traveling, where English uses an -ing form. Spanish usually uses the infinitive instead.

If you want a full clause with a subject and tense, Spanish often uses después de que + conjugated verb:

• Mi amigo tiene sueño después de que viaja is usually not the best version here.
• More naturally: Mi amigo tiene sueño después de que viajó if you want to emphasize that the traveling happened as a completed event.

But in this sentence, después de viajar is the simplest and most natural structure.

Both can be correct, but they are not exactly the same.

• después de viajar = after traveling
• después del viaje = after the trip / after the journey

The first focuses on the action. The second focuses on the trip as a thing/event.

Examples:

• Tiene sueño después de viajar. = He gets sleepy after traveling.
• Tiene sueño después del viaje. = He is sleepy after the trip.

In many situations, they are very close in meaning.

Because Spanish often leaves out subject pronouns when they are not needed.

The verb tiene already tells you the subject is he/she/you (formal), and mi amigo is already stated, so adding él would usually be unnecessary.

So:

• Mi amigo tiene sueño... = perfectly natural
• Él tiene sueño... = also possible, but only if you want emphasis or contrast

For example:

• Mi amigo tiene sueño, pero yo no.
• Él tiene sueño, pero ella no.

Usually, yes.

• amigo = male friend / male person who is a friend
• amiga = female friend

So mi amigo normally refers to a male friend.

A few extra notes:

• In some contexts, amigo can sometimes be used generically, but in a simple sentence like this, most learners should understand it as my male friend.
• mi does not change for gender, so both are:
  • mi amigo
  • mi amiga

Yes, but it means something a little different.

• tiene sueño = he is sleepy / drowsy
• está cansado = he is tired

Someone can be tired without feeling sleepy, and someone can feel sleepy without being generally tired.

So:

• tiene sueño focuses more on wanting sleep
• está cansado focuses more on fatigue/exhaustion

Both could be true after traveling, but they are not exact synonyms.

Yes, it can move.

The original order is very natural:

• Mi amigo tiene sueño después de viajar.

But Spanish is fairly flexible:

• Después de viajar, mi amigo tiene sueño.

Both are correct.

The difference is mostly about emphasis:

• Ending with después de viajar sounds neutral.
• Starting with Después de viajar emphasizes the time/circumstance first.

It can often be understood as a general statement, especially without more context.

• Mi amigo tiene sueño después de viajar. can mean my friend gets sleepy after traveling in general.
• It can also describe a current situation if the context makes that clear.

If you want to make it clearly about a specific completed event, Spanish might use something more explicit, for example:

• Mi amigo tiene sueño después del viaje.
• Mi amigo tiene sueño después de haber viajado.

But the original sentence is perfectly natural and can work in either a general or context-dependent way.

Yes. In much of Latin America, luego de is also common.

So these can both work:

• Mi amigo tiene sueño después de viajar.
• Mi amigo tiene sueño luego de viajar.

Both mean essentially the same thing: after traveling.

That said, después de is very widely taught and understood everywhere, so it is a very safe choice for learners.