DAE have nights where you can’t tell if you ever fall asleep or not?

I sometimes have nights where I spend a long time tossing and turning when I get into bed and a long time being half awake before waking up for good, but can’t tell if I fell asleep at any point or not. The night passes by too quickly for me to feel like I was lying awake in bed for eight hours, but I also can’t remember waking up from sleep at any point or any fragments of dreams. I usually feel tired the next day, but not as tired as if I’d stayed up the entire night. Anyway, I’ve had two nights in a row where this happened and I’m starting to get concerned at my possible inability to properly fall asleep.