Не стоит преувеличивать такие мелочи и недооценивать усталость после длинного дня.

Не стоит + infinitive is a very common Russian way to say it’s not worth doing, you shouldn’t do, or there’s no point in doing.

So:

• Не стоит преувеличивать... = It’s not worth exaggerating...
• In natural English here, it often comes out as You shouldn’t exaggerate...

This structure is softer and less direct than a command like Не преувеличивай. It sounds more like advice or a general observation.

They are infinitives because they depend on Не стоит.

The pattern is:

• не стоит + infinitive

So:

• Не стоит преувеличивать
• Не стоит недооценивать

Russian often uses infinitives after modal-like expressions such as:

• можно = it is possible / allowed
• нельзя = it is forbidden / impossible
• надо = it is necessary
• не стоит = it’s not worth / you shouldn’t

Also notice that there are two infinitives joined by и:

• преувеличивать такие мелочи
• и недооценивать усталость

Both are equally governed by Не стоит.

These are imperfective infinitives, and that makes sense here because the sentence gives general advice, not a single completed action.

• преувеличивать = to exaggerate
• недооценивать = to underestimate

With не стоит, the imperfective is very common when talking about behavior in general: don’t do this kind of thing.

A perfective version would sound more like a specific single action in a particular situation, which is not the main idea here.

Такие мелочи is in the accusative plural.

The verb преувеличивать usually takes a direct object, so the thing being exaggerated goes in the accusative:

• преувеличивать что? → такие мелочи

Here:

• такие = such
• мелочи = small things / trifles / minor details

For this noun, the accusative plural looks the same as the nominative plural:

• nominative plural: мелочи
• accusative plural: мелочи

That is normal for many inanimate nouns.

Мелочи is the plural of мелочь.

Depending on context, it can mean:

• small things
• minor details
• trifles
• little things

In this sentence, it suggests things that are not very important. So такие мелочи means something like such minor things or such little details.

Усталость is in the accusative singular, because it is the direct object of недооценивать:

• недооценивать что? → усталость

The noun усталость is feminine, and for this type of noun, the accusative singular looks the same as the nominative singular:

• nominative: усталость
• accusative: усталость

So the form does not change, even though the case function does.

The preposition после always requires the genitive case.

So:

• после чего? → после дня = after the day

Because длинный describes день, the adjective must also be in the genitive singular masculine:

• длинный день → nominative
• после длинного дня → genitive after после

So both words change:

• длинный → длинного
• день → дня

Both длинный день and долгий день are possible, and both can mean a long day.

But there is a slight nuance:

• долгий often emphasizes duration in time
• длинный literally means long and can also be used figuratively for time expressions like a long day

In practice, both are understandable here. Долгий день may sound a bit more expected to some learners, but длинный день is also natural enough in many contexts.

Russian often leaves the subject unstated when the meaning is general or impersonal.

This sentence is not aimed at a specific you grammatically. It is an impersonal construction:

• Не стоит... = It’s not worth... / One shouldn’t...

English often uses you in a general sense, but Russian does not need to say ты or вы here.

Yes. И connects two infinitive phrases that both depend on Не стоит:

• преувеличивать такие мелочи
• и недооценивать усталость после длинного дня

So the sentence means:

• It’s not worth exaggerating such minor things
• and underestimating tiredness after a long day

Both actions are presented as things one should avoid doing.

Yes, Russian word order is flexible, though the original order sounds natural.

For example, you could also say:

• Не стоит недооценивать усталость после длинного дня и преувеличивать такие мелочи.

That is grammatically fine, but it shifts the emphasis a bit by mentioning недооценивать усталость first.

The original version feels balanced and natural:

• first, don’t exaggerate minor things
• second, don’t underestimate tiredness after a long day

Russian word order often helps manage emphasis rather than basic grammatical relations.

Historically, it is built from parts, but for a learner it is best treated as a full vocabulary item meaning to underestimate.

Breakdown:

• оценивать = to assess / evaluate
• недооценивать = to underestimate

The prefix недо- often carries the idea of insufficiently or not enough.

So:

• оценить / оценивать = to evaluate
• недооценить / недооценивать = to undervalue, underestimate, fail to appreciate fully

In this sentence, недооценивать усталость means to underestimate how important or serious tiredness is.

It sounds like gentle advice or a general recommendation.

Because it uses Не стоит, it is:

• less harsh than an imperative
• more reflective than a direct order
• suitable in both conversation and writing

Compare:

• Не стоит преувеличивать... = softer, advisory
• Не преувеличивай... = direct command to one person
• Не преувеличивайте... = direct command to several people or formal singular

So the original sounds thoughtful and measured.