What is the ruling on parents refusing my waking up to seek knowledge and memorize the Qur'an from Fajr until a quarter of an hour before Dhuhr, knowing that I sleep 6 to 8 hours at night, including a nap?

If parents prevent their child from waking up early to seek knowledge and sustenance without a valid reason, then obedience to them in this matter is not obligatory. This is because they do not have the right to prevent their mature child from what benefits him in his religion and worldly life. It is recommended for the child to deal with them gently and wake up without their knowledge.