In al-tahdhib, Abu 'Abdullah said, as he recollected the prayer of the Holy Prophet:

 

He would bring his ablution water, cover it and place it near himself, and he would put his siwak under his bed.  Then, he would sleep for as long as Allah willed.  When he woke up, he would sit, turn his eyes towards the sky and recite the ayah from (surah) ale Imran: "Verily in the creation of the heavens and the earth..." (3:190).  Then, he brushed his teeth and performed ablution, after which he went to his place of prayer and performed four rak'ahs with the duration of his ruku' (bowing) being equal to his recitation (while standing) and the duration of his sujud (prostration) being equal to that of his ruku'.  He would bow in ruku' until it would be asked: 'When will he raise his head?'  And he would prostrate in sujud until it would be asked: 'When will he raise his head?'

 

He then returned to his bed and slept for as long as Allah willed.  then he woke, sat up, and recited the ayah from ale Imran and looked towards the sky.  Then he brushed his teeth, performed ablution and went to his place of prayer where he performed the Witr prayer and two (other) rak'ahs (i.e. the nafilah of Fajr), and then he left his house (to go to the masjid) for the (Fajr) prayer.

 

-- Sunan an-Nabi