Tell me why H HAS to stay up until 3 or 4 AM??

Now with H on 2nd shift and not getting home until 11PM, he feels the needs to stay up playing his video game until 3 or 4AM, which in turn keeps me awake. He plays it with his headphones on so I don't hear it, but even with our bedroom door closed I still hear him randomly talking loudly to the cats, walking up and down the hall to the kitchen to get something to eat, going to the bathroom. He says that he has to stay up that late so he can sleep until 10 or 11AM. Why? Why does he HAVE to sleep until 11AM? Why can't he come home, come to bed within the hour and get up at 7or 8AM and THEN play his game? He doesn't have to leave the house until after 1PM. I get that he wants to decompress from work, but can't he do that in an hour and come to bed? Then I get up at 5:30 and feel like every single move I make is annoying him. Unlike him, I can't be out of the house within 10 minutes of waking up. When he was on 1st shift he'd literally get up at 4AM and get dressed and pour a cup of coffee and be out the door in less than 10 minutes. He never showered, combed his hair, washed his face, brushed his teeth...just left. I need to be up at least an hour before I leave the house. If he would come to bed right away then I wouldn't feel so bad about making noise in the morning, but when he is just coming to bed at 4AM and I am getting up 1 1/2 hours later, I feel I annoy the crap out of him. Although he never seemed to give a crap about how loud he was being at 4AM so why should I be so concerned about being quiet?

Now he's back on 1st shift for just this week and back to getting up at 4AM. Every single morning I have to hear the alarm go off at least once. Then he gets up and turns on the closet light and does all this heavy sighing like he's just not had enough sleep and how can he possibly go to work. Then the clomping down the hall and slamming cupboards and drawers and then slamming the front door when he leaves for work. I get up when he's sleeping and basically tiptoe around the house and freak out that a floorboard is going to creak and he's going to go ballistic!