How is your sleep? You said you get 8 hours of sleep. Is it good sleep or do you wake up a lot? This is how I get after I haven't been able to sleep more than 3 hours total every night for several weeks to months. I go lay down and try to sleep for 8 hours but I constantly wake up every 45 minutes or so because of my oxygen getting to low I think. My body automatically wakes me up. And then once I am awake, I have anxiety about needing to empty my bladder. So, I then get up. The 3 hours I get is in total. I wake up at least three times in those three hours. When this happens for a long time, I get Narcolepsy type symptoms where I can just fall asleep during the day at any given moment. But I also have that severe grogginess and being out of it upon wakening when I finally get into a deeper sleep toward the morning and my body tries to wake me up. If you look up Narcolepsy, I was surprised to find out that their symptoms is because they constantly wake up during the night and therefore don't get nearly enough sleep as they need and then eventually taking its toll, they begin falling asleep during activities during the day.
It also reminds me of my milder bits of sleep paralysis. Do you try to move your body at all during these times? Are you awake enough to think about trying? I think before you said you try to wake up. If so, can you move your limbs? And during that time are you in and out of dreaming but at the same time you know you are in your bed? Early hour sleep paralysis isn't uncommon for people who have it. Just trying to get more information.