Depends really. Guinness and beers make me pretty laid back until something fun happens (which could be as little as someone falling over), while Tequila makes me get up, lead the drunks to the nearest nightclub and then dance mindlessly for a few hours to songs I know the lyrics for but by this point I'm thinking too slow to keep up. I wouldn't compate it to being sleepy, as I don't want to go to bed if I'm having a good time.