I can sleep until it's really light with a sleepmask. My sleepmask is black and lets in no light at all. Ok we do absorb light through our skin aswell, but this makes a dramatic difference to my sleep. Using a sleepmask will reduce the amount of light that might disturb your sleep.

I tend to sleepwalk if it's pitchblack, something to do with not waking up properly from dreams, so I have experimented with light in the room etc. The only light that doesn't adversely affect my sleep is a dim nightlight in the hall where a tiny amount of that light seeps under the closed door, enough to orient me if I wake at night.
Hope that helps. Go for it. Yes to the earplugs aswell - give yourself as much help as possible to not be disturbed in your sleep.

Remember, before we were more civilised we used to sleep in caves and have always slept under shelter which would probably have reduced the effects of starlight etc.