Tbol is one of my favorite orals and never had an issue but I know some individuals can't take orals in the evening bc they have a hard time falling a sleep. Could be accidental if it happened only once. Sometimes we don't even realize that something is botheting us in the back of our head. The only real way to find out is to experiment with your body for few days. I noticed that sometimes at the beginnig of my cycle I do have trouble with sleep. I always thought that my body is reacting this way to the rapid rise in the hormon levels, meaning your body is thrown off balance and it has to adjust.