No you're not on your own. I am 18 months in from losing my husband and I get like this too. I used to have naps in the afternoon but then that spoiled the bedtime routine and found I was lying awake for most of the night. I've managed to change my routine slightly and very seldom have the afternoon naps now but that's not to say you should stop if it's something you want to do just do it. Grief affects everyone differently. For me this year, it has been coming to the fore and I have been slowly working my way through it. I still have really `down days or weeks` but I think it is all part and parcel of the process. Just know that you are not alone with this. just keep coming here when you feel you need to. Take Care.
