There are two competing interest here; (1) the most inportant factor to overall health is sleep and (2) The most important part in overall fitness is consistency in routine.
So the OP's question is should I deviate from my routine in effort to get more sleep. The answer, as is always is with any thing health and fitness related, is, "it depends."
First, getting up at 5:30 is hard and if you start regularly skipping sessions it is just going to get harder. So maintaining that routine is critical. Part of maintaining that routine is getting to bed on time and if you can't get to bed on time regularly you need to question the whole routine. But assuming you are asking about the rare exeption of when you can't get to bed on time break it down into two catagories:
1) Minor deviation in sleep pattern. Example: It is a random wednesday night and you can't get to sleep until 11pm. Your nutrition has good and you feel great. In this case you are going to get up at 5:30. Sure sleep is important but maintaining that routine is going to trump that lost sleep.
2) Major but temporty deviation in sleep patter. Example: Something came up at work and you've been putting in late nights, eating paleo-ish fast food, and are generally stressed out. In the last 2 weeks you've had several days of getting to bed late. In this case, get some sleep.
In summary, go by how you feel and how often your sleep is getting disrupted. Try to maintain the routine unless maintaining the routine comes at the expense of your recovery. I know that's obvious but it is really no more complicated then that.