Theerapun,
Sawatdee kap!

Doing any form of physical exercise before going to bed is not a good idea if you want to sleep well. Regular exercise earlier in the day, though, is very good.

The Arnold book will NOT make you look like those professional bodybuilders. Even if you have the genetics for that, you have to remember that these guys are also taking A LOT of drugs.

E-mail me if you have any questions regarding exercise or if you want a good program. I work part time as a personal trainer and have ten years of experience in the field and I'd be happy to help.