I just recently started watching anime again few months ago. The ones I've been watching are Golgo 13, Desert Punk, Lupin the 3rd, Cowboy Bebop, Trigun, Devil Man, New Dominion Tank Police, Ghost in a Shell, Outlaw Star, and Tenchi Muio.
I honestly don't really sleep. I use something that keeps me up for very long periods of time so I can work long hours. I won't mention what that something is, but it works for what its used for. Sleep has become a distant memory for me, and I figure I can sleep when I'm dead.
I honestly only watch cartoons from the 90s, but if I have to choose , I would say Regular Show. I don't watch either one of them, but from what I've seen out of the both of them, Regular Show has that slight 90s feel to it.