Are you drinking enough water? Too much water?
How long did you sleep?
Sometimes when dieting, even when eating less, you have more energy because even though it's less food, it is more nutritionally fulfilling thank the junk we usually eat, therefor giving us more energy, making us not need as much sleep.
I survive on about 5 hours a night sleep now, when I was much heavier I would have 9 hours and still be tired.
So the important question, less sleep, but are you feeling tired?
12th June: 16"10(234lbs)