As you can see, this is normal. I had family home with me the first 5 days home, then friends popping in during the day for the second week. By the third week I was fine alone, but I napped most of the time. For me, it wasn't so much that I was tired, it was that I had absolutely no resilience. So, I could kind of get started doing things, but then find myself to be completely drained in a pretty short time. I'm sure that having little ones around who are so completely inexhaustible and energetic is bound to be difficult.
Maybe you can find some very sedentary activities to do with your children -- puzzles, movies, board games? Then, it may seem like you are active, but you can actually be doing something somewhat restful.
Do check on your meds. Beta blockers can be tiring. If your BP is low, that can tire you. And certainly you can feel drained from low iron.
Be patient! Be good to yourself. Stand up for yourself. If your instincts tell you something's not right, do not hesitate to call your doctors.
Marguerite
Oh, and living in the Northwest during the dark winter months can be unsettling and confusing to your body. I mean, it still gets dark at 5pm here!! Your body might be thinking it's sleepy time! But we're past the winter solstice so that means the days are getting longer each day!! yay!!! Before we know it, everyone else will be in the dark by 8 and our sun will still be shining at 9:30 at night!! Hang in there!!