Originally Posted by Pavel Alasheev
The only thing that bugs me is sleep. I used to be able to sleep 3 or 4 hours a night for weeks and have no visible negative effects. I could get up whenever i needed to no matter how much sleep i had got. Now it's very different, if i don't get enough sleep for two nights, i feel really drowsy all the time and sometimes just cannot resist the urge to fall asleep.
This seems like this sleep deprivation could be the source of your problems. While surely everyone has different sleep requirements, this is way
on the low side for most people. Also, this may be way off and only you can really say for sure, but maybe the change was just gradual and you didn't really notice it. Its possible that the diet change did in fact give you a clearer mind and more energy and as a result you can only now notice the effects of sleep deprivation. I'm vegetarian, and I didn't notice any energy gains when I switched, but I wasn't looking either. As some people have said here, I really notice an energy drain (as well as stomach trouble sometimes) when I consume dairy. Maybe eliminating dairy would be something to try.