Kada se osećaš umorno, možeš da ostaneš u krevetu još malo.

Kada means when. In this sentence, it can also sound like whenever:

• Kada se osećaš umorno... = When/Whenever you feel tired...

In everyday speech, the shorter form kad is also very common.

Because se is a clitic: a short, unstressed word that usually goes in the second position in its clause.

So after kada, the clitic comes immediately after it:

• Kada se osećaš umorno...

In a simple main clause, you would normally see:

• Osećaš se umorno. = You feel tired.

Both forms contain the same pieces; the word order changes because of the clitic rule.

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

Here, osećaš and možeš both show 2nd person singular, so ti is understood automatically.

• (Ti) se osećaš
• (Ti) možeš

You would add ti only for emphasis, contrast, or clarity.

Osećati means to feel or to sense.
Osećati se is the common expression for to feel in the sense of to be feeling in a certain state.

So:

• osećaš se = you feel

The se here is not translated as yourself in normal English. It is just part of the Serbian expression.

After osećati se, Serbian very often uses forms like dobro, loše, umorno to describe how someone feels.

So:

• osećam se dobro = I feel good
• osećaš se umorno = you feel tired

This is a very common pattern.

If you want to say I am tired, you often use a gender-marked adjective instead:

• Umoran sam. = I am tired. (masculine speaker)
• Umorna sam. = I am tired. (feminine speaker)

So in this sentence, umorno is normal and idiomatic.

It can cover both ideas, depending on context.

Here, možeš suggests:

• you can
• you may
• you are able/allowed to

So the sentence can sound like either a possibility or a gentle permission/suggestion:

• When you feel tired, you can stay in bed a little longer.

In Serbian, after many verbs—especially modal verbs like moći (can)—it is very common to use:

• da + present tense

So:

• možeš da ostaneš = you can stay

This is how Serbian often expresses what English does with an infinitive.

A learner should remember this as a basic pattern:

• mogu da idem = I can go
• želim da učim = I want to study

Ostaneš is the 2nd person singular present form of ostati, meaning to stay, to remain, or to end up staying.

So:

• možeš da ostaneš = you can stay / remain

In this sentence, it means stay in bed a bit longer.

This is an aspect question.

• ostati = perfective
• ostajati = imperfective

Here, ostati is natural because the sentence refers to a single, complete action: stay a little longer on a given occasion.

• možeš da ostaneš još malo sounds like you can remain a bit longer

If you used ostajati, it would sound more habitual or ongoing in a different way, and it would not be the normal choice here.

Because u krevetu expresses location, not movement.

• u krevetu = in bed / in the bed
• u krevet = into bed

Compare:

• Ostani u krevetu. = Stay in bed.
• Idi u krevet. = Go to bed.

So here, since the person is already being told to remain there, u krevetu is correct.

Literally, još malo means still a little or a little more.
In this sentence, the natural English meaning is:

• a little longer
• for a bit longer

So:

• ostaneš u krevetu još malo = stay in bed a little longer

The first part, Kada se osećaš umorno, is a subordinate clause placed before the main clause, so a comma is used:

• Kada se osećaš umorno, možeš da ostaneš u krevetu još malo.

This is similar to English:

• When you feel tired, you can stay in bed a little longer.

Yes. Serbian word order is flexible, though not completely free.

For example, you could also say:

• Možeš da ostaneš u krevetu još malo kada se osećaš umorno.

That is still understandable, but the original version sounds very natural because it introduces the when-condition first.

Also, some small shifts are possible for emphasis, such as moving još malo, but the original sentence is a very standard and neutral phrasing.

You would use the vi forms:

• Kada se osećate umorno, možete da ostanete u krevetu još malo.

That can mean:

• When you all feel tired, you can stay in bed a little longer.
• When you feel tired, you can stay in bed a little longer. (formal singular)