I had been regular with fajr .Lately I have noticed it has became a challenge.I developed an issue with my knee cus of which i have to sit most of the time also pray sitting down.When i wake up from sleep i have pain,close alarm lie down,and sleep through fajr.My day is spent watching Islamic videos,learning Quraan, Facebook,whatsapp. Nothing haram. I pray other prayers on time.
You have to make more effort to wake up and pray! You must go to bed early! Sleeping over fajr is a sign of hypocrites.
Drink lots of water at bedtime so that you simply have to get up.
The other deeds you do all day are not obligatory, fajr is!