Some days we sleep in late. Even if we set our alarm we wake up and realize we missed fajr. Some people go back to sleep others wake up. The sunnah of the Prophet (pbuh) is to pray fajr as soon as we wake up.
Do not let missing fajr be the reason for you to miss your other prayers. If we miss fajr it should give us even more of a reason to pray our other prayers to the best of our ability.
“Whoever offers the two prayers (Asr and Fajr) will enter Paradise.” (Bukhari)