It dependson what you intend by your workout: Aerobics or weights?

Those who have been around here longer could point you to some exact references, or you could search this forum for 'exercise time'. The unvarying consensus is that the BEST (which is not the same as the only!) time for an aerobic workout is before breakfast. The reason is that the night's fast has depleted any available sugars, so when your body needs fuel, it burns fat. You do not have to have a gym to do aerobics. :-) is there a ceiling high enough to jump rope? Are there any stairs you could climb? Some people find aerobic workout videos helpful.

For weight training, you would do best to read Trainerdan's sticky's on the top of this forum for more info on that, but basically you will need more carbs to lift with any intensity, and you can check the various sub forums (BFL, CKD) for more info on that. If you only want to lift light weights, anytime within 2.5 hours after your last meal should be work.

You mention 11:00p.m. as when facilities are available. For aerobics, long after meals is good, although not as good as pre-breakfast, for the reasons given above.

Does that help?

Kipling