You know Vonny i stay up late and get up almost late these days, watching TV or browsing net. But i could never figure it out what's the reason and by reason i mean the basic, core, the main psychological element which forbids you from sleep. No matter how you're tired or suffer from your sleep time, you can't close your eyes. Thoughts, worries and even desire to get up and play or watch TV haunts you. Many opinions i heard and many books i read yet i can't define it. Atleast for myself.