All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
First of all, you should know that you are not sinful if you overslept and woke up after the time of the prayer has ended.
But you are obliged to perform the prayer once you wake up. You have to take the reasons that would help you wake up, such as setting an alarm clock, or appointing someone to wake you up, and so forth.
If you sleep straight away after the ‘Isha prayer, then this would help you to wake up at Fajr as there is blessings in endeavoring to wake up early.
You should not stay awake late at night without any preponderant benefit, and you should seek the help of Allah, and ask Him to make this matter easy for you.
You should endeavor against your own evil self and accustom yourself until it becomes a habit for you and a natural binding character in you.
It is by accustoming ourselves that we get used to something, and it is by training ourselves that we learn and are trained.
An authentic Hadeeth reads: “Whoever seeks to be patient, Allah will give him patience.”
Allah knows best.