Could my 15 month old be missing his daddy? Sleep problems?

My fiance got promoted to management at a local family restaurant chain and now works crazy hours and is gone a lot more. This week he has been gone from 2pm-12:30am or later. Prior to him getting this new job we would always put our son to bed together and have done this pretty much since birth. With my fiance schedule constantly changing week to week it makes it hard on both my son and myself. He is usually a great sleeper but tonight he will not go to bed no matter what I do. He cried on and off for 2 hours. I sang to him, read him books watched mickey mouse clubhouse together, gave him a bath.He is getting teeth but it's never really bothered him that much. He kept saying daddy or doggie? (they're both close sounding the way he says them) It's only this week that my fiance worked straight the hours I stated above. He has worked this shift a few weeks ago but it was only a day or two. My fiance works 2 Midnight shifts in a row coming up this april which he will be gone from 9:30pm- 7:30am or later. this is very stressful on both my son and myself who are both used to him being here at night with his family. I truly think my son misses his daddy he only gets to see him a short few hours before my fiance leaves for work. He loves his daddy. During his crying spell when I went to sooth him he kept saying "daddy" or it could have been "doggie" they both sound the same coming from a crying 15 month old learning to talk. My son is still awake as I write this and I don't think he will go to bed until his daddy comes home from work. :( Poor little man I wish he could tell me what was wrong then I wouldn't have to get advice on here. Do you think its him missing his daddy and that is why he will not sleep or could it possibly be theething? He never had a problem with teething only a little fussy but tonight was the worst I've seen him ever!