“醒了又睡，睡了又醒。”

hmm I'm not sure if there's an equivalent saying in Chinese but I guess I'll say something like"今天生病，一天醒了又睡，睡了又醒，感觉昏昏沉沉的" .

睡得不稳， 我最近睡得不稳，总是半夜会醒。 浅眠，人在睡觉的前两个小时都是属于浅眠状态，很容易醒。 I'm not sure if I have misundertood your phrase

迷迷糊糊，半睡半醒！

我一整天都不舒服，一直在床上躺着，迷迷糊糊地醒了睡睡了醒。 For reference.