xiàbān yǐhòu, tā bù xiǎng yìzhí shàngwǎng, zhǐ xiǎng wán yíhuìr yóuxì, ràng zìjǐ bú nàme lèi.

下班以后 means after getting off work or after work.

In Chinese, time expressions usually come before the main action, so it is very natural to put 下班以后 near the beginning:

• 下班以后，他……
• After work, he...

This is one of the most common sentence patterns in Mandarin:

• 时间 + 主语 + 动作
• time + subject + action

So the structure here is very normal and natural.

Yes. All of these can work:

• 下班以后
• 下班后
• 下班之后

They all mean after getting off work.

The differences are small:

• 后 is shorter and very common.
• 以后 is common in both speech and writing.
• 之后 can sound a little more formal or slightly more written, though it is also used in speech.

So:

• 下班以后，他不想一直上网。
• 下班后，他不想一直上网。

Both are natural.

The pattern is:

• 不想 A，只想 B
• doesn’t want to do A, only wants to do B

So in this sentence:

• 他不想一直上网，只想玩一会儿游戏。
• He doesn’t want to stay online the whole time; he only wants to play games for a little while.

Chinese often uses this kind of contrast very directly:

• 不……，只……
• not..., only...

It is clean and efficient, and it sounds very natural.

Here 一直 means something like:

• continuously
• nonstop
• the whole time

So 一直上网 means:

• stay online the whole time
• keep surfing the internet continuously

Depending on context, 一直 can also mean all along or always, but in this sentence it clearly means continuously / for the whole stretch of time.

上网 literally means go onto the internet, but in real usage it often covers several English ideas, such as:

• go online
• use the internet
• surf/browse the internet

So in this sentence, 一直上网 does not necessarily mean only the moment of connecting to the internet. It means something broader, like spending a long time online.

In Mandarin, duration phrases often go after the verb and before the object in this kind of sentence:

• 玩一会儿游戏
• play games for a little while

This pattern is very common:

• verb + duration + object

Examples:

• 看一会儿书 = read for a little while
• 学两个小时中文 = study Chinese for two hours
• 打半天电话 = talk on the phone for half a day

So 玩一会儿游戏 is the natural word order.

Yes, here 一会儿 means:

• a little while
• for a short time
• for a bit

So:

• 玩一会儿游戏 = play games for a little while

Be careful: 一会儿 can have different meanings depending on context:

1. a little while / a short time

   • 等一会儿。
   • Wait a moment.

2. in a little while / soon

   • 我一会儿去。
   • I’ll go in a little while.

In your sentence, it is clearly the first meaning: for a short time.

This is because of tone sandhi with 一.

The basic tone of 一 is first tone: yī.
But its pronunciation changes depending on the following tone:

• before a 4th tone, 一 becomes 2nd tone
• so 一会儿 is pronounced yíhuìr

Since 会 is huì (4th tone), 一 changes:

• 一会儿 → yíhuìr

This is a very common pronunciation rule in Mandarin.

That is another very common tone-change rule.

The basic tone of 不 is 4th tone: bù.
But when 不 comes before another 4th tone, it changes to 2nd tone: bú.

So in this sentence:

• 不想 → bù xiǎng
  because 想 is 3rd tone, so no change

• 不那么累 → bú nàme lèi
  because 那 is 4th tone, so 不 changes to bú

This is standard Mandarin pronunciation.

Here 让 means something like:

• make
• let
• allow

So 让自己不那么累 literally means:

• make himself not so tired
• let himself be less tired

In more natural English, it often means:

• so he won’t feel so tired
• to help himself feel less tired

So the idea is:

• He only wants to play games for a little while, so that he can relax and not feel so tired.

自己 means self / oneself.

In 让自己不那么累, it emphasizes that the effect is on himself:

• to make himself less tired
• to let himself relax a bit

If you removed 自己, the sentence would feel incomplete or would need a different structure, because 让 usually needs to show who is being made or allowed to do something.

So:

• 让自己不那么累 = natural
• 让不那么累 = not natural

Here 那么 means so or that in the sense of degree:

• 不那么累 = not so tired
• not that tired

This is different from 很累:

• 很累 = very tired

So:

• 不那么累 does not mean not very tired in exactly the same way as English always would; it means not so tired / less tired than before or than expected.

In this sentence, 不那么累 fits well because it suggests reducing the level of tiredness.

In Mandarin, adjectives can often function like verbs.
So 累 can mean to be tired all by itself.

That means:

• 他很累。 = He is tired.
• 我不累。 = I’m not tired.

You do not usually say:

• 他是累。 ✘

So in 让自己不那么累, 累 naturally means be tired.

Yes. The sentence can be understood like this:

• 下班以后 = after work
• 他不想一直上网 = he doesn’t want to stay online the whole time
• 只想玩一会儿游戏 = he only wants to play games for a little while
• 让自己不那么累 = to make himself less tired / so he won’t feel so tired

So the overall logic is:

• After work, he doesn’t want to be online nonstop; he just wants to play games for a little while so he can feel less tired.

The final part explains the purpose/result he wants.

Yes, in standard Mandarin it is normally pronounced here.

一会儿 includes 儿化 (the -r sound), so it is commonly said as:

• yíhuìr

This is a very common fixed form.
You will often hear learners say yíhuì, but yíhuìr is more standard in Putonghua for this word.

That said, in some regional accents, the -r may sound weaker or may be dropped more often.

Yes, that is a very natural English interpretation.

Even though the Chinese does not literally say unwind, the phrase:

• 让自己不那么累

communicates the idea of:

• relaxing
• recovering from tiredness
• unwinding a bit

So to unwind is a good natural translation, as long as you remember the Chinese wording is literally closer to make himself feel less tired.