Vi bokade tiden i förväg, så vi slipper bli stressade på morgonen.

Bokade is the past tense of boka, which means to book or to reserve.

So:

• vi bokar = we book / are booking
• vi bokade = we booked
• vi har bokat = we have booked

In this sentence, Vi bokade tiden i förväg tells you that the booking happened before the morning being talked about.

Tiden is the definite form of tid.

• tid = time
• tiden = the time

But in this sentence, tiden most likely means the appointment / the time slot, not just abstract time.

So Vi bokade tiden means something like:

• We booked the time
• or more naturally in English, We booked the appointment/time slot

Swedish often uses tid in this way when talking about reservations, appointments, or scheduled times.

I förväg means in advance or ahead of time.

So:

• Vi bokade tiden i förväg = We booked the appointment in advance.

It is a very common fixed expression in Swedish.

More examples:

• Tack i förväg = Thanks in advance
• Man måste planera i förväg = You have to plan ahead

Here så means so, so that, or as a result.

It connects the two parts:

• Vi bokade tiden i förväg
• så vi slipper bli stressade på morgonen

Together:
We booked the appointment in advance, so we avoid getting stressed in the morning.

So så introduces the result or purpose-like result of the first action.

Slipper comes from slippa, which means to avoid, to not have to, or to be spared from something.

Here:

• vi slipper bli stressade = we avoid getting stressed
• or we won’t have to get/be stressed

This verb is very common in Swedish.

Examples:

• Jag slipper jobba i morgon. = I don’t have to work tomorrow.
• Hon slipper vänta. = She doesn’t have to wait / She gets to avoid waiting.

So slippa often expresses a kind of relief.

Because bli means become or get.

So:

• bli stressade = become stressed / get stressed

If you said only vi är stressade, that would mean we are stressed.
But vi slipper bli stressade means we avoid ending up stressed.

So the sentence is about preventing that state from happening.

Because it agrees with vi.

In Swedish, adjectives often change form depending on whether they describe:

• a common gender singular noun
• a neuter singular noun
• a plural
• or a definite noun

Here the adjective refers to vi = we, which is plural, so the plural form is used:

• stressad = stressed (singular)
• stressat = stressed (neuter singular)
• stressade = stressed (plural / definite)

So:

• Jag är stressad = I am stressed
• Barnet är stressat = The child is stressed
• Vi är stressade = We are stressed

In Swedish, på morgonen means in the morning.

This is just the normal expression:

• på morgonen = in the morning
• på kvällen = in the evening
• på natten = at night
• på eftermiddagen = in the afternoon

Even though English uses in for some of these, Swedish often uses på.

Also, be careful not to confuse:

• på morgonen = in the morning
• i morgon = tomorrow

They look similar but mean different things.

Both patterns can exist in Swedish, but they do not always feel exactly the same.

Here, så vi slipper bli stressade på morgonen is a natural way to continue after the first clause. It keeps normal clause order:

• subject + verb
• vi slipper

If you wrote så slipper vi bli stressade på morgonen, that is also possible, but it sounds a bit more like and then/therefore we avoid..., with more emphasis on the result.

So:

• så vi slipper... = neutral, smooth continuation
• så slipper vi... = possible, slightly more emphasis on the consequence

No. The problem is slippa does not match English slip.

Even though they look a bit similar, slippa means:

• avoid
• not have to
• be spared

So better translations are:

• We booked the appointment in advance, so we avoid getting stressed in the morning.
• We booked the time slot in advance, so we won’t have to be stressed in the morning.

This is a good example of a false friend.

It can feel like both, depending on how you read it.

• Result: We booked in advance, and as a result we avoid stress.
• Purpose: We booked in advance in order to avoid stress.

Swedish så often allows this kind of overlap in everyday sentences.
So a natural English understanding is:

• We booked the appointment in advance so that we wouldn’t get stressed in the morning.

That captures the idea very well.