I rarely stay out really late...the dance venues in my area open early, and we have very few of them. So, I usually go and dance from 7pm-10 or 11...and take a class during the week that is 2-3 hours of constant movement...but I'm considering going out of town to get more dancing in. Once a week is never enough Salsa!
I don't think I'll ever become a hardcore Salsa nut...I've got to get sleep and take care of all the things going on in my life...I'm a morning person...early hours are for yoga and qi gong.
Squirrel - You do Ki Aikido? Have you ever met Koichi Tohei Sensei? He's very inspiring. I too practice martial arts...so it can be tough to find a balance between Salsa, sleep and training time. Whatever works for you!
SG