Tengo sueño hoy.

In Spanish, sleepiness is usually expressed with tener + a noun, not with ser or estar.

So Spanish says:

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

This is different from English, where we often use to be + adjective.

So Tengo sueño is the normal, natural way to say I’m sleepy.

Tengo is the first-person singular present tense form of tener.

That means:

• tener = to have
• tengo = I have

So grammatically, the sentence is built as:

• Tengo = I have
• sueño = sleepiness / sleep
• hoy = today

Even though the literal structure is I have sleepiness today, the natural English meaning is I’m sleepy today.

Spanish often leaves out subject pronouns when they are already clear from the verb ending.

Since tengo clearly means I have, you do not need yo.

So:

• Tengo sueño hoy. = normal
• Yo tengo sueño hoy. = also correct, but yo adds emphasis or contrast

You might use yo if you want to stress I:

• Yo tengo sueño hoy, pero ella no.
  I’m sleepy today, but she isn’t.

Because tener sueño is a fixed expression.

Spanish commonly uses tener + a noun without an article for physical states and needs:

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

So Tengo sueño is correct.

If you say tengo un sueño, that usually means I have a dream rather than I’m sleepy.

Here, sueño means sleepiness or the need to sleep.

That is why tener sueño means to feel sleepy.

Be aware that sueño can also mean dream, depending on context. For example:

• Tuve un sueño extraño. = I had a strange dream.

But in the expression tener sueño, it means sleepiness, not dream.

They are related, but not the same.

• Tengo sueño = I’m sleepy / I feel like sleeping
• Estoy cansado / Estoy cansada = I’m tired

You can be:

• tired without being sleepy
• sleepy without feeling physically exhausted

So if you specifically mean you want to sleep, Tengo sueño is better.

No. Tengo sueño stays the same for everyone.

That is because sueño is a noun, and the expression tener sueño does not change with the speaker’s gender.

Compare:

• Tengo sueño. = same for men and women
• Estoy cansado / cansada. = changes depending on gender

So Tengo sueño hoy works no matter who says it.

Yes. Hoy is flexible.

These are all possible:

• Tengo sueño hoy.
• Hoy tengo sueño.
• Tengo hoy sueño. — grammatically possible, but less common and less natural

The most natural options are usually:

• Tengo sueño hoy
• Hoy tengo sueño

Often, Hoy tengo sueño sounds slightly more natural if you want to emphasize today.

Yes, it is completely natural and widely understood throughout Latin America.

You may also hear:

• Hoy tengo sueño.
• Tengo mucho sueño. = I’m very sleepy
• Me da sueño. = It makes me sleepy / I get sleepy

But Tengo sueño hoy is perfectly normal.

Yes. A very common way is to add mucho:

• Tengo mucho sueño hoy. = I’m very sleepy today

You can also say:

• Hoy tengo muchísimo sueño. = I’m extremely sleepy today

This is a very natural way to intensify the idea.

A helpful approximation is SWEH-nyo.

Key points:

• su sounds like sweh
• ñ sounds like the ny in canyon
• the stress is on sue

So:

• sueño ≈ SWEH-nyo

And the full sentence:

• Tengo sueño hoy ≈ TEN-go SWEH-nyo oy

Yes, but it is less common in everyday conversation.

• Estoy soñoliento / soñolienta means I’m sleepy
• Tengo sueño is much more common and natural in daily speech

So learners should usually prefer Tengo sueño first. It is the expression you will hear most often.