Witr and Nawaafil

Reading four rakaats nafl salaah after the fardh of Esha

Q: I heard that 4 rakaats after Esha is equal to Tahajjud Salaah on Laylatul-Qadr. I wanted to know what's the tarteeb of reading these 4 Rakaats, is it 2 Sunnah and 2 Nafl before Witr or is it 2 Sunnah then 2 Nafl and another 2 nafl then Witr or is it 2 Sunnah and 4 Nafl with one Salaam and then Witr? 

Also, what will be the count of the Esha Rakaats taking into consideration either 4 or 2 Rakaats before, these 4 mentioned in the Hadith and also the 2 Rakaats sitting after Witr?

Performing the witr before going to sleep

Q: It was the practice of Nabi (sallallahu alaihi wasallam) to read his witr salaah after he slept and woke up for tahajjud. I would like to follow this Sunnah, however there is fear that I may not wake up for tahajjud and miss my witr. 

Is it permissible and will I get the same reward as following a Sunnah of Nabi (sallallahu alaihi wasallam) if I delay my witr till before I go to bed, read my witr and then sleep? Do I get the reward of following Sunnah?