Shift Work....Tiring

Finally completed 3 days of shift work. Yawn. I'm feeling tired now. I have had worked really long hours previously but somehow when shift work does not feel like overtime, it becomes more of a stretch. I have been lucky that my initial stretch of shift work is in the day shift. After next week, I'm going to be in the night shift. Ooooh. I hope I can stay awake at night.