I have been hitting the gym for 2 years now. I know that sleep is very crucial to muscular development. My problem is that my job has placed a strain on my workout routine. I now get up at 0430 and I am not off work until 1830-1900. I then have to change, and get to the gym. After I am done with everything, its late. Most nights I get about 4-5 hours of sleep. I know this isnt enough. I have noticed that my endurance is dropping slightly. But my question is: Should I lower the intensity until I can get the proper sleep my body needs?