YABU OP, but with good reason on this occasion.
DH used to want me to go to bed when he did, his parents made a big thing of going to bed at the same time, a bit like a previous poster, they think it's what good couples do (although there are issues there, MIL is apparently now not capable of spending any time alone, if FIL goes out he has to organise something for her to do with other people first).
I don't agree that couples need to go to bed at the same time as each other every night, and I don't think you can impose a bedtime on an adult.
That said, if DH had a busy day or early start once in a while, and really didn't want to be disturbed by me going to bed significantly later than he was, I'd go to bed when he did even if I wasn't tired, but it would be the exception rather than the rule.
In your circumstances, it wouldn't have hurt your DH to go to bed when you did.
I'm sorry for your recent losses. I know how hard that first day back can be. 