I haven't had hardly any negatives since switching nine months ago to the carnivore way of eating. I have been really strict with the food intake and on occasion drink a glass of milk (somewhere between a glass weekly/bi-weekly). I started off with the eat when I was hungry approach and that pretty much turned into OMAD (and as said before, I didn't know it had a name or that eating once a day was a 'thing'). As of late I have increased my food intake to hit a protein per day target as I am lifting and trying to build muscle. I have an auto-immune disease and building/maintaining muscle mass off-sets the progression of the disease. 

My issue: On my days off I am up early around 4:30 or so and get to the gym a little after 5. I lift for a little more than an hour, come home put on the weight vest and walk for a hair over three miles. After the walk I shower and eat breakfast. It is usually 4 eggs and whatever meat we had left over from the night before. If no leftovers it is fresh sausage made the week before, sometimes it is bacon. The off to whatever I am doing for the day. This past weekend I cut up a couple fallen trees and busted the wood for the grill. (used a wood maul to bust the wood/no log splitter). Yesterday I cut some steel to make spring hangers for the project truck I am working on and the day before I used the back-pack blower to push the leaves into the woods (live in an oak grove so the leaves are just about year around work). As the day ends I usually fire up the grill for the evening meal.

Fir the past month or so when I eat the evening mill it hits a switch and no sooner than I am finished I am gassed out. No energy, tired as all get out, and simply can't hold my eyes open. If I try to power thru in the recliner, I end up sleeping in ten-to-fifteen-minute intervals, and once rested can't sleep much that night. If I go to bed I am up at midnight as wide awake as can be for the rest of the night.

I am a life-long rotating 12 hour shift employee so my sleep patterns suck due to the shift work but have not ran out of gas, all of a sudden zapped for energy before. It seems to have started when I started adding the extra protein for muscle growth. 

Anyone experienced end of the crashes? It is all of a sudden, from 100 to 0 as soon as I finish eating. Feel great one minute and can't get out of my the next. 

Scott

I have and still do occasionally. I don’t know why and I don’t know the answer but I can only assume that it may have something to do with the digestive process and all your blood going to digestion. 
I push on through and will not nap, otherwise like you I won’t sleep well. 

I just ate and instead of watching TV for the next few minutes I am going out in the shop and get the old truck frame in epoxy. I'm hoping the crash can be avoided by being a little more active after eating. The next few hours will tell.

Thanks for the reply.

Scott