It’s good to hear you are still resting after waking up. So my question then is have you researched biphasic sleep? It means you divide your sleep period into two distinct segments. You can look up, Biphasic Sleep: What It Is And How It Works, in google and an article by the sleep foundation, which is fact-checked, explains what it is and how it works. Apparently, it is really common among humans and other animals alike to sleep like this. A lot of normal sleepers wake up after sleeping for 3-5 hours, myself included. That first part of sleep is usually quite deep, when I would pass out and remember nothing about it until I woke up. Then I would get up, use the toilet and go back to bed to sleep for the second part. The later part is characterized by more light sleep, lots of vivid dreams and a lot of morning glories if you are male too. I heard this is when most of REM sleep occurs because dreaming happens more. So if I told you that what you are experiencing is actually quite normal, would you feel more at ease? Don’t fight the wake ups, accept them and move on. After waking up, going back to bed is your first choice to try to see if you can fall back asleep. Otherwise, you could get up and do something light and non strenuous and try again after an hour. I read most people in pre-industrial age actually did this so perhaps what you experience is just an remnant of what people used to do then. Good luck.