Q. Is it permissible for one to forgo Witr salaat earlier in the night so that one has to wake up for Tahajjud and pray Witr then?

A. It is permissible to do so. It is preferred to do so if one knows that they can wake up to perform the tahajud prayer and thereafter the Witr Salaat .

In fulfilling this great sunnah, one must not bind hardship upon oneself. That is not what Sharia desires. The task should be challenging, not a burden in its performance, nor a hindrance to ones everyday tasks, family life, etc.

Allah Certainly Knows Best.