That's everything I needed to know. Thanks.
Go to confession as soon as you can.
Also, to Reconquest: read the (traditional) mass from your missal, with the proper. This is general practice for when you cannot assist on Sunday.
You are in mortal sin; 40 minutes travel for a valid mass of St. Pius V is not unreasonable, far from it. Are you a Catholic or not?
It goes without saying that you should not attend a suspect and bastard rite, no matter how nearby it is. If you have questions about why this is so, I welcome them.
In general, it is irreligious to stay up so late on a Saturday without an important reason. Sunday is the Sabbath; it just doesn't do to wake up late and sluggish, with half of it already gone. We should wake up early, with prayer in our hearts and thanksgiving on our lips.
The only thing I would add to this, is that I'm not sure it's true to say 40 minutes is not unreasonable. The reason that if I was in this position I would consider myself in mortal sin is this: If it is a drive I am accustomed to, that means it is within my means. Different people have different means. If I drive forty minutes to mass every week (that's about the drive we made to our Resistance Mass center this morning) then obviously it is within my means. For some people it may not be. I've heard different magic numbers when it comes to how far for mass is 'too far' (i.e., at what point you are absolved of the obligation) but never anything conclusive.
Sleeping in and missing mass is a sin of neglect. Unless necessity drives us to, we should go to bed at a reasonable hour Saturday evening because we have an obligation in the morning. The principle isn't all that different from a parent not feeding their kids because they forgot. The fact that you didn't
positively intend to miss mass does not lift the obligation. We are only excused from the obligation if necessity demands it (e.g., staying home with sick kids, being ill yourself,
have to work).
Pray your missal if you can't reach mass (which is a Traditional Mass or a Divine Liturgy) and then get to confession if you've missed it because of sloth or another insufficient reason.