nǐ jīntiān zhème lèi, gāi zǎodiǎnr shuìjiào le.

In Mandarin, many adjectives can function as predicates by themselves, so you do not need a verb like to be in the same way English does.

So:

• 你今天很累。 = You are tired today.
• 你今天这么累。 = You’re so tired today.

Here, 累 is acting like the main predicate of the clause.
Using 是累 would sound wrong in normal Mandarin.

这么 means something like so, this much, or to such a degree.

In this sentence:

• 你今天这么累 = You’re so tired today / You’re this tired today

It emphasizes the degree of tiredness.

A useful pattern is:

• 这么 + adjective
• 这么 + verb phrase

Examples:

• 这么忙 = so busy
• 这么晚 = so late
• 这么想 = think this way

In your sentence, 这么累 means so tired, not just tired.

Yes, but the nuance changes.

• 你今天很累。 = You’re tired today.
• 你今天这么累。 = You’re so tired today.

很累 is a more neutral statement.
这么累 sounds more expressive and often sets up a response or conclusion, such as:

• 你今天这么累，该早点儿睡觉了。
• Since you’re so tired today, you should go to bed early.

So 这么 helps connect the first part to the advice in the second part.

该 means should, ought to, or sometimes it’s time to depending on context.

Here, 该 gives advice or says what is appropriate:

• 该早点儿睡觉了 = you should go to bed a bit earlier / it’s time you went to bed early

It is softer than a strict command, but it still clearly suggests what the speaker thinks is the right thing to do.

Compare:

• 你该休息了。 = You should rest now.
• 该上课了。 = It’s time for class.
• 我该走了。 = I should go / It’s time for me to leave.

So in your sentence, 该 is giving natural advice based on the situation.

The final 了 here is a sentence particle. It does not mean past tense by itself.

In this sentence, 了 adds a sense of new situation, changed circumstances, or now it’s appropriate.

So:

• 该早点儿睡觉。 = You should go to bed early.
• 该早点儿睡觉了。 = You should go to bed early now / It’s about time you went to bed early.

The 了 makes the advice sound more immediate and situation-based. Because the person is tired now, the speaker is saying the situation has reached the point where going to bed early is the right move.

Often it can mean either, depending on context.

In this sentence, 该早点儿睡觉了 can feel like a mix of both:

• you should go to bed early
• it’s time to go to bed early

That is very common in Mandarin. The grammar does not always divide meanings as sharply as English does.

A few examples:

• 你该回家了。 = You should head home now / It’s time for you to go home.
• 我们该出发了。 = We should leave now / It’s time to set off.
• 你今天这么累，该早点儿睡觉了。 = You’re so tired today; you should go to bed early now.

Because Mandarin often omits repeated subjects when they are already clear.

Your sentence is:

• 你今天这么累，该早点儿睡觉了。

The second clause is understood as still referring to you:

• 你今天这么累，(你)该早点儿睡觉了。

Repeating 你 is possible:

• 你今天这么累，你该早点儿睡觉了。

But leaving it out sounds natural and smooth, especially when the subject is obvious from context.

早点儿 means a bit earlier or earlier.

It comes from:

• 早 = early
• 点儿 = a bit / a little

So:

• 早点儿睡觉 = go to bed a bit earlier

This does not necessarily mean early in an absolute sense. It often means earlier than usual or earlier than now might suggest.

Examples:

• 早点儿来。 = Come a bit earlier.
• 你该早点儿休息。 = You should rest earlier.

The 儿 is part of an erhua form, common especially in northern Mandarin and in standard spoken Mandarin.

Here:

• 点
  • 儿 → 点儿

So 早点儿 is a very common spoken form.

You may also see it written or typed as:

• 早点
• 早一点
• 早一点儿

All are understandable, though the nuance and style may differ slightly.

In pinyin, 点儿 is often written diǎnr, reflecting how it sounds in connected speech.

Yes. That is perfectly natural.

Compare:

• 早点儿睡觉
• 早一点儿睡觉

Both mean go to bed a bit earlier.

The first is shorter and very common in everyday speech.
The second is slightly more explicit because it keeps the full 一点儿.

You may also hear:

• 早点睡觉

That is also common in conversation.

Here, 睡觉 functions as a verb phrase meaning to sleep or to go to bed / sleep.

So:

• 我睡觉。 = I sleep / I’m going to sleep.
• 早点儿睡觉。 = go to bed earlier

Literally, 睡 means sleep, and 觉 historically relates to sleep, but learners should usually just treat 睡觉 as a set verb expression.

In this sentence, 该早点儿睡觉了 means should go to bed earlier, not just should sleep earlier in a technical sense.

It has a very common observation + conclusion/advice structure:

• 你今天这么累， = You’re so tired today,
• 该早点儿睡觉了。 = you should go to bed early now.

So the first part describes the situation, and the second part gives the speaker’s judgment or advice based on that situation.

This kind of pattern is very common in Mandarin:

• 你明天还要上班，该早点儿休息了。

• You still have work tomorrow, so you should rest early.

• 天这么晚了，该回家了。
• It’s so late; it’s time to go home.

Yes, the comma helps show the sentence has two parts:

1. the situation: 你今天这么累
2. the advice/result: 该早点儿睡觉了

In speech, there is usually a small pause there.

Without the comma, people would still understand the sentence, but the written version with the comma is clearer and more natural.

It is very natural. It sounds like something a friend, family member, or partner might say.

It has a caring tone:

• You look very tired today,
• so you should go to bed early.

It is advice, not an order.
If you wanted to sound even softer, you could also say:

• 你今天这么累，早点儿睡吧。
• Since you’re so tired today, go to bed early.

That version uses 吧, which often softens suggestions.