Yesterday I started a new diet using intermittent fasting. For this reason I only ate one meal all day. I was pretty surprised how well I passed that day: I studied a lot, did some sports and fulfilled several programming exercises from university. After sports I had my first meal. Overall—a great day without any side effects from the intermittent fasting.
However, at 11 PM I went to bed. There I realized that I was not tired. So I read a book. One hour passed—still no feeling of fatigue. So, I thought, some push ups will make me tired. Nope, the push-ups did not work. It was already 1 AM, and I had to get up early. I decided to use my strongest means, which I only use before big exams: a glass of brandy. No effect! Meditation—nope. After that, 30 minutes of running outside in the cold—again, no effect. At 4 AM I decided to get up and study.
A weird experience. I know that I lack sleep; nevertheless, I can study and concentrate.
I Googled the keywords fastening and sleeplessness. Then I realized that it is a common pattern that some people sleep less during fasting.
Why is fasting related to insomnia?