Yes, our standdown rooms are provided for the very reason you allude to eyeinthesky. After a night shift (known as a doggo in Oz), Workplace health and safety requirements are for us to have facilities for fatigued staff to retire to before going home, if they require it.
The standdown rooms also get used by many controllers to sleep in prior to starting a doggo. The Ops Supervisor keeps the keys to the rooms (which are to some degree soundproofed as well), and will even wake you up at the required time if you ask nicely.
Just don't expect a chocolate on the pillow.
DP