This is really difficult to describe but I've never experienced it until the past few months. In my life I've had times where I can't fall asleep and times where I've fallen asleep but woken up in the night unable to get to sleep. But the past month or so I've been feeling sleep, falling asleep and then not long after (up to an hour) just opening my eyes as if I've not been asleep and without the sleepiness. But I then het tired again and do the same. Over and over in the night. It's the waking up that's weird bc it's as if I haven't even been to sleep or felt the drowsy part where I know I am falling asleep.