This can wreak havoc on your relationship, but only if you let it. In every relationship compromises are necessary, and this might be a big one. However, don't let it come down to comparing which job is more "important" or "stressful" because nobody's going to win. Every job is important, stressful, and has pros and cons.
Obviously the best thing you can do is try to work towards a schedule that's a little more forgiving, but what if that's not possible? You can still make it work with the right attitude and a few adjustments. After all, this isn't a real crisis and there are couples who work in different countries for years but still nourish their marriage. Here are a few ways to get by:
1. Optimize the time you do have together
Chances are, there are at least a couple of hours per week where neither of you need to be sleeping and your schedules overlap. Do you spend this zoning out in front of screens, running errands, or doing different tasks in different rooms? Stop. Make the most of any time you have together, and try to think of this like all the good parts of an illicit affair: You wouldn't spend precious time with a lover picking up groceries, would you?
2. Touch base at least weekly
Carve out 15 minutes every week to talk in person about concerns, issues around the house, parenting troubles and anything else that requires action. Anything more than 15 minutes, outside of a genuine crisis of course, is not helpful. However, this time is critical so that one partner doesn't feel like they're taking on all the responsibility. Communication is critical, especially when you can make it in person.
3. Be realistic about your sleep hygiene
Sleep hygiene is important, and most people need around eight hours in order to get the most benefits (although is varies person to person). One partner shouldn't be sacrificing sleep just to spend time with another. However, if you've logged your eight hours and just like to loll in bed while your partner is having breakfast, make the compromise. Get up, join them, and try setting your alarm a little earlier if you really like that lucid waking stage.
4. Vacation together
There's a high chance that you both have some vacation time each year, or you at least get the same major holidays off. When that happens, plan a vacation (even if it's a staycation) and cherish this rarity. These days, many excuses are made such as the appeal of getting time and a half or simply opting out of paid vacation days altogether. Breaks are a necessity to recharge your physical, mental, emotional health as well as your relationship. Use them.
5. The little things matter
If you don't see your spouse while you're at work, then you don't see them much at home, do what you can to be "present" during their day. Write cheesy romantic notes and tuck it into their packed lunch, or do their least favorite chore if you happen to get home early. The little things are what add up and nurture a relationship, not the big grand gestures.
Most importantly, remember that you're not a rarity and many other couples are in the same boat. Some make it work, but many do not and it's the "try" that makes all the difference. Keep committed and remember that it's likely not a permanent situation.