Struggling to wake up for Fajr consistently – any tips for a sustainable routine?

Assalamu alaikum everyone. I'm really trying hard to pray Fajr on time, but my body just gives up after a few days. Here’s what my day looks like: I pray Isha around 11:30 PM, then head to bed at midnight. I set my alarm for 4 AM to pray Fajr and then stay awake until 6 AM because if I sleep again, I won’t wake up for school. School plus travel takes from 6 AM to 7 PM. After that, I cook, eat, study, and do whatever else needs doing-no naps because I’m scared I won’t sleep exactly at midnight. Then it’s bedtime again at 12 AM. This works for like three days max, then I crash with fatigue, body aches, brain fog, and I can’t get up at all. So I end up taking a break, sleeping fully, then starting over. I only manage Fajr occasionally like this. Does anyone have a realistic, sustainable schedule that actually works long-term?