Yes, but not all the time. It depended on the situation. Sometimes I would go to bed at 10:30pm and wake at 3:00am and take some. I would do that for a couple days in a row (that didn't last long). Or I would stay up late then wake up at a normal time and take some. Most of the time I would sleep 8 hours and I would just take some because I would stay alert and focused all day (this most likely occurred on a Friday).