Is the inability to get out of bed to study after waking up due to being overcome by sleep considered disobedience to parents?

Since you are unable to wake up when your mother rouses you, you are not considered disobedient to her for that. However, you must take the necessary measures that will help you obey her, such as sleeping early so you can wake up early. Waking up early is recommended and a source of blessing, as the Prophet (peace be upon him) said: "O Allah, bless my nation in their early mornings."