Sooo tired

I am 27 weeks and so exhausted! I work on my feet all day and sometimes (a lot) I pull eleven hour days. I have a family at home and I want to spend time with them but I am soooo tired, and well at times I get a guilt trip for being tired and wanting to go to bed earlier. How do you all feel? And what can I do to cope with my internal struggle? It's been eight years since I have been pregnant so this is all new to me having such a far gap in my pregnancys.