Can you continue praying tahajjud if you forget it sometimes?

Salam I just wanted to know if you forget to pray tahujaad namaz Can you still continue reading them..Because I was told that you have to constantly read them…

Alaikumassalam wa rahmatullah,

The tahajjud prayer is a voluntary prayer that you can do whenever you are able. There is no requirement to do them constantly, and if you do not do it for a while you are always free to start again.