Yes. Too often I'm affraid. Last night only slept 5 hours, because I wasn't tired when I had to sleep, and my alarm woke me up on the usual time, so I had to get out.
There was once when I was ill that I couldn't sleep due to breathing problems (nose full etc) that I slept only 1 to 1,5 hours max before waking up, trying to do that 2 or 3 times during the night, so I slept a total of 4 hours max each night. It was really breaking me in the end, but when my nose problems got better I would sleep better too.
Have you ever had a mess in your room, lost something then finally cleaned your entire room hoping to find that missing item, only to remember where it was (not in your room) after you cleaned your entire room?