Sleeping

Manner of reciting and blowing on one's body after reciting the 3 quls

Q: Please clarify the procedure regarding the hadith below.

1. Should one read the surahs once, then blow, then once again and blow, then again and blow. Or should one read 3 times then blow once? Or should one read once and blow 3 times?

2. Should one blow such that a bit of saliva comes on to one's hand when blowing?

It is narrated from Sayyidah ‘Aaishah (radhiyallahu ‘anha) that every night, when Nabi (sallallahu ‘alayhi wa sallam) went to bed, he would cup his hands together and blow over them after reciting Surah al-Ikhlaas, Surah al-Falaq, and Surah al-Naas. He would then rub his hands over whatever parts of his body he was able to, starting with his head, his face, and the front of his body. He would do so three times. (Sahih al-Bukhari, 5017)

How much sleep should a person get?

Q: We hear from scientists and doctors nowadays that adults need 6-9 hrs of sleep and teenagers need at least 9 and so on respectively. We also heard about great Ulama and still in the present time who only sleep a couple of hours.

My question is that does Islam have a stance on sleep and do you think we should follow this research?