Yes this is very common especially if you're in ketosis. Its due to switching to a fat metabolism and thus having less highs and lows (blood sugar) that you get with eating carbohydrates.

They use ketogenic diets for epilepsy patients that don't do well with meds.

Yes at times I can relate to that..... I do feel much healthier on a low carb diet.....

I feel 100% healthier on a LC diet - best thing I ever did

During the first week of starting my moods are all over the place...My son calls it Keto mood! I also experience some headaches This last about a week for me. I find I have much more energy now and my moods have stabilized. I'm starting week 4 tomorrow

I haven't done low-carb for a few years now. I've been following it for 4 days and feeling sharper and more focused. Had a major craving for something sweet and full of caffeine on day 2 so I scoffed a whole bottle of Pepsi Max (no sugar), but apart from that I've been fine. Mild headache this morning but I'm pretty sure that was from caffeine withdrawal - a double espresso fixed that right up.

I've been a bit more inclined to get watery eyes over silly things or sad news stories, but I suspect that is more due to my wife and kids being away than low carb.

One more slight issue: I'm a lot less tired at the end of the day than I used to be. I guess processing all those carbs was wearing my body out, and making my brain fuzzy. So I haven't been getting to sleep until nearly 1am and then waking up before 7am (I know this is a normal night's sleep for a lot of people).

Either I'm going to have a couple of extra hours per day on this diet , or my body will adjust back to wanting 7 or 8 hours sleep.

Hi Bill,
I've been on low carb now since January and my sleeping habits are totally different now.
I need a lot less sleep than before, sometimes it's very annoying when you've got an available sleep in but your body fights it off.
I generally only need 6-7 hours sleep nightly now.

Thanks Bianca. That's good to know.

My sense of smell is much keener now too. I picked some mint and basil today and they smelt wonderful.

There's been so many positives for me, which is why I've finally realised @ 35 years of age this is now a lifestyle and not a diet.
You can't beat fresh herbs, they smell great !

I was pretty moody over the weekend (days 3&4) as I was feeling sorry for myself not being able to have my treats! However, I'm starting to remember and enjoy the taste of real foods. Instead of craving sweets, I'm looking forward to having some fresh berries I'm could still easily scoff some sweet things, but I'm white knuckling it as I've done so well this week. I'm still really tired though (but I'm low in iron and haven't taken my tablets for a couple of weeks).

Its probably minerals, if you can make or buy some bone broth that will help a lot

Thanks Sherrie
I've read so much about bone broth but the long slow roasting of bones puts me off. I might give it a try this weekend though. I've also had bad cramps in my legs this week too and the headaches are still around. I'm a great advert for this Low carb life

Caffeine withdrawal or dehydration will do that, make sure you're getting plenty of electrolytes whilst they readjust to ketosis.