On a global scale not every country will be night and vice versa,so if u wake up for tahajud,it’s not like the whole world is sleeping,i know that you sacrifice your sleep for the creator.it’s the questions that confuses me,ie:
Reported By Abu Hurayrah:
The Messenger of Allah(saw) said:"Our LORD descends to the lowest heaven during the Last Third of The Night,inquiring, "Who will call on ME so that I may Respond to Him? Who is asking something of ME so I may Give it to him?,Who is Asking for MY FORGIVENESS so I may FORGIVE HIM…
"So does that mean the creator comes down several times in a 24 hour period,surely all around the world someone wakes up for tahajud,which means there is daylight somewhere else,so there are a couple of million people awake,whilst others are perfoming tahajjud at the same period of time on the universe.