The more you please Allah, the better sleep you have.
May Allah make us among his closest ones and give us all the ability to wake up for Tahajjud and to please Him. Ameen!
If you plan on ignoring tahajjud just because your sleeping hours do not get completed, then remember that you feeling energized is not dependent on the number of hours you sleep, but instead depends on how much Allah blesses your sleep.
And trust this:
Your du’a is never ignored.
Allah responds in different ways: by giving you what you asked for, by delaying it for a better time, or by turning away something that wasn’t good for you.
I used to wake up for Tahajjud every night, asking for the same things. And still, nothing seemed to change.
Until I realised something uncomfortable:
I was speaking to Allah… but I wasn’t staying long enough after my du’a.