I had been having episodes like what you are describing. I have been getting 5 hours a night and sometimes I have 6-7 hours when I am super drowsy. With PCS, it seems my sleep has ups and downs. 5 hours of sleep usually makes me feel better too. I suffer from insomnia frequently, sometimes only getting 5 hours of sleep and never going back to sleep, forcing me to stare at the walls until the sun comes up. Gotta love winter, right?