Formal:
* أنا في الفراش: (Ana fi al-farash) - This is the most literal and formal translation.
* أنا مستلقٍ في السرير: (Ana mustalqin fi al-sarir) - This means "I am lying down in bed".
Informal:
* أنا نايم: (Ana nayem) - This means "I am sleeping", which implies you are in bed.
* أنا بالسرير: (Ana bil-sarir) - This is a more casual way of saying "I'm in bed".
Note: The choice of the best translation depends on the context and the level of formality you want to convey.