Please don't get me wrong
@abcd99 , but your son is 26 years old. So a grownup that should be respected as such and also a person with a disability he needs to take care of himself. Sneaking in to check his sensor without his consent is not helping to have a trusted relationship. Just saying. Fairly newly diagnosed young need to have some space and time to get to terms with this disease on their own terms. Don't be too pushy or insisting non-stop. Let him determine the moment he feels ready to share some of his experiences with you in confidence and potentially also giving you a copy of his Libre Reader reports, as its better to get these for an informed discussion/review than nailing him down on a few single point observations that may or may not be within 'acceptable bg range'.
Sleeping with and waking up with a bg around 64-76 mg/dl is not alarming, as long as he is not engaging in rapid exercise right away. For the values you mention below that range I would personally just take glass of juice or something else with quick working carbs in to get it up above 80 mg/dl, which is the considered minimum to be 'normal bg'.
Regarding his Type1, then that is a chronic disease that he will have now for the rest of his life, based on the medical technologies available today. Likewise he will need to take his insulin injections every day. Anybody saying on YouTube that he/her cured their Type1 diabetes is not correct. You have many crooks online taking money from naïve people they scam to believe that they can cure them or their children/relatives of diabetes 1.
You have of course the monumental surgical procedure to receive a pancreas transplant from a deceased donor, which then potentially could cure your diabetes. But such organ transplant is still today considered more risky to your health than living with diabetes type1 and also brings along with it other medications that needs to be taken for the rest of your life not to mention the risk factors such as diminished immune system functionality and organ rejection.