Maybe I should say it isn't REALLY a sacrifice. Not when compared to real sacrifices. Getting 8 hours of sleep a day is actually a gift. Maybe it's even a first world problem. In developing countries there are people work/away from home for over 14 hours a day to make ends meet, so chances are pretty high they're not going to get 8 full hours of sleep.
So when living intentionally leads to "sleep deprivation" and "sacrificing our sleep" to help others, I think it's okay. For our health, it's probably a good idea to aim for 8 hours on a regular basis, but we know we can function with less and it's such a small thing.
We drove with our friends to the airport to go through Customs and Immigration and to catch their flight to Bogota (their refugee claim was denied). We left home at 3am... and if you know us, you know that 7am is a stretch for us. But it was worth it so that we could pour every ounce of love into them before they left.