ausschlafen
to sleep in
To sleep until you wake up on your own and feel rested, usually without being woken by an alarm clock.
Am Wochenende kann ich endlich mal wieder richtig ausschlafen.
At the weekend I can finally really sleep in again.

to sleep in
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to sleep in
To sleep until you wake up on your own and feel rested, usually without being woken by an alarm clock.
Am Wochenende kann ich endlich mal wieder richtig ausschlafen.
At the weekend I can finally really sleep in again.

'Ausschlafen' (to sleep in) is a separable verb. The prefix 'aus-' goes at the end in a main clause. In subordinate clauses and in the infinitive, the verb stays together.
Am Sonntag schlafe ich immer aus.
On Sundays I always sleep in.
The verb is very often used reflexively: 'sich ausschlafen' (to get a good long sleep / to sleep until rested). This form emphasizes that you allow yourself the rest that comes from sleeping for a long time.
Nach der anstrengenden Woche muss ich mich am Wochenende erst einmal richtig ausschlafen.
After the exhausting week, I first need to really sleep in properly at the weekend.
'Ausschlafen' (to sleep in) has an exclusively positive meaning. It describes restful, intentional long sleep, not accidentally oversleeping and missing an appointment.
Es ist ein wunderbares Gefühl, morgens ohne Wecker aufzuwachen und zu wissen, dass man ausschlafen darf.
It is a wonderful feeling to wake up in the morning without an alarm clock and know that you are allowed to sleep in.
to sleep
'schlafen' and 'ausschlafen' both have to do with sleep. 'schlafen' simply describes the state: you are not awake and are resting. 'ausschlafen' means that you sleep until you have had enough sleep and feel rested. Often there is no alarm clock or early appointment involved. So you can sleep without sleeping in, for example if you have to get up early.

Am Sonntag kann Lisa endlich ausschlafen, weil sie keinen Wecker stellen muss.
On Sunday, Lisa can finally sleep in because she does not have to set an alarm.
Nach der langen Reise möchte ich heute früh schlafen.
After the long trip, I want to go to sleep early today.