[Rei]

I don't know. I think everybody sooner or later suffers from insomniac periods. But insomnia as a disturb is something that doesn't hit you for a day or two in a lifetime. In that case I don't think this should be considered insomnia. Insomnia is a chronic disease (I'm not a doctor, but I guess it can be considered like this). Sometimes you cannot sleep because you're worried, excited or simply because your body doesn't need too much rest. Seasonal changes can influence this too. Also hormones, I guess. And many other things you don't usually think as responsible for the lack of sleep. If it lasts for a long period of time and you're exhausted or feel really bad because you really can't sleep (you can't concentrate, you can't take care of your usual occupations, you feel your sight is getting worse, you suffer from constant migraines and other similar problems), that means the disturb is starting to rule your life and you need to see a doctor