First of all, I agree with Dreyth, parallel or lower is best because you'll know what good depth is. That's why I like like full squats(personally, people are different), you don't have to judge depth if you hit max ROM every time. Half is cool if you are tall/lanky(long femurs/back), or you have a pre-existing injury that causes pain at deeper depths, like Adarqui's SI joint/hamstring tendon, or something like FAI.
The yawning thing: make sure you get tons of sleep dude. Using 8 hours as an ideal time is fine for normal people, but in my opinion every hardworking athlete should shoot for 9 even. What I mean is, 8 should be a bare minimum from a day to day basis for you. Also, the hours you count should be the ones where you're actually asleep, not tossing and turning. You can get away with getting 5-6 hours of sleep every now and then, but it can add up if you're working hard and not getting rest.
You can also try listening to meditating, listening to relaxing music, going for a walk, or anything else relaxing to make sure you feel good for you workouts. It only takes 15-30 minutes a day, sit down(or walk, whatever) and relax, without any distractions or anything that will make you think too much. More sleep + relaxation = amped when training comes along.
Deloading is something you should have scheduled. I've come off deloads before where I've felt great the first day and like shit the 2nd or 3rd day, even though the training wasn't that intense/draining. Would that mean I would deload? No, because I was bound to have a bad day or 2 here and there. There's no telling whether or not you're CNS is drained or not, because you often can push yourself and set PRs when you feel like shit. Sometimes when you feel good you don't PR at all for whatever reason.
With that said, you can schedule your deloads whenever you want, just make sure you have it planned first. People with different ages, work capacities/amounts of GPP, tendencies, etc. will have different responses to training for a certain period of time. You can deload every 3 weeks, every 6 weeks, whatever, do it every once in a while to make sure you stay healthy.
