Witr Salaah

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?

Qiraat in the second or third rakaat of witr salaah being longer than the first rakaat

Q:

1. In the witr prayer, is it makrooh tahreemi, makrooh tanzeehi, or permissible to recite a surah in the third rakat which is longer by three verses or more than the surah which was recited in the first rakat and is it makrooh tahreemi, makrooh tanzeehi, or permissible to recite a surah in the third rakat which is longer by three verses or more than the surah which was recited in the second rakat?

2. In a fard prayer or in a wajib prayer, if two surahs have the same number of verses but not the same number of words then would it be makrooh tahreemi, makrooh tanzeehi, or permissible to recite the surah which has less words in the first rakat and to recite the surah which has more words in the second rakat?