to sleep
The German word 'schlafen' is the infinitive form of the verb 'to sleep'. It is used in the same way as its English counterpart, for example: 'Ich muss schlafen' (I need to sleep). It can also be conjugated into different forms, such as 'ich schlafe' (I sleep), 'du schläfst' (you sleep), 'er/sie/es schläft' (he/she/it sleeps), 'wir schlafen' (we sleep), 'ihr schlaft' (you all sleep), and 'sie schlafen' (they sleep).
I want to go to sleep
In this sentence, 'Ich möchte schlafen gehen' is a common phrase used when someone wants to go to bed or sleep. It is directly translated as 'I want to go to sleep'.
You are not allowed to sleep now
The sentence 'Du darfst jetzt nicht schlafen' can be used when telling someone that they should not or are not allowed to sleep at the moment. It translates directly into English as 'You are not allowed to sleep now'.
She loves to sleep
The sentence 'Sie liebt es, zu schlafen' is a simple statement about someone's preference for sleeping. The direct translation to English is 'She loves to sleep'. It can be used to talk about a person's love for sleep in general.