Effects - Feel terrible after napping after having just one beer. Any reasons?

[juliotangos]

One question I'd like to ask. I've been drinking this beer, called "Goser" (I think that's the spelling), which I believe is a relatively good beer from Germany or one of the beer-drinking countries in Northern Europe. I never get a headache even if I drink five or six of them the next day.

The problem is when I drink and then take a nap immediately afterwards. Has anyone else experienced this as well? And if so, what's the cause of it? I've had others tell me that it's not good to drink and then nap immediately afterwards? Is that true and why? What happens to the body when you're napping after drinking for you to feel terrible?