The ideal amount of sleep is seven to eight hours per night. You can let loose a night or two each week, but when you do, try to make up for it ASAP. Train no more than four times a week. As for your job, do whatever you can to avoid excess stress; chronic nervousness elevates cortisol, a hormone that makes your body store fat and burn muscle.
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Do you think if you power napped during the day then you could reduce your night time hours ?
If I had to guess, I would say probably not. Depending on how long you are napping it is pretty hard to get in the late stages of sleep, or REM, in for example, a 30 minute nap.
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"Don't be upset by the results you didn't get with the work you didn't do."