I've recently noticed that on days when I perform "high intensity" exercise (either heavy compound weight training or sprints) I end up with insomnia and toss and turn the whole night. I've been paleo (plus pastured butter and cheese) for a year and a half now, and have been weight training consistently for two years, but the insomnia has only appeared in the last few months. I thought I might be overtraining, so I took two weeks off to rest, but the insomnia came right back when I started up again. I've also tried taking magnesium (Natural Calm), but if anything, that seems to make it worse. I try not to train for more than 45 minutes (much less for sprints) and generally do my workouts before noon. Anyone else have this problem? Or have any idea what's physiologically causing it?
Update: I think Eva nailed it. I tried upping the carbs in that half hour after working out, and then again an hour before bed (instead of keeping to the usual 16 hour fast). Slept like a rock. Thank you Eva! Of course, now I'm going to have to rethink my whole low carb approach to paleo... Maybe I can just try to cycle them more to match my exercise levels?