When i used to work and play poker i would often go through the night - then get up and into work about an hour early and sleep in a toilet cubicle. Used to do this on the lunch break too! Remember to set your phone alarm mind you! And try not to snore!
I have a mate that used to do similar sort of things, he obviously kipped in the loo from time to time, but he often went to the stationary cupboad for a kip but hold various items in his hand incase he was interupted!
I play late at night but am fortunate enough to have a job where I can turn up when I like if getting up early is too much for me that day. Weekends aren't so good for me as I get up early with our daughter, but I still play a bit. I play more during the week though so to spend some time at least with the family at the weekend.