I also take a diuretic for my heart and that means I'm up every hour or two to pee at night. Sometimes I can't fall back to sleep and just stare at the clock. That's why I'm at the computer at 5 AM typing this.
My normal biorhythms are disrupted when I'm under stress and not following my normal routine. I also don't think a full 7-8 hour sleep at night is needed as I get older and my physical activity during the day has slowed down.
Some days I get so tired I can't keep my eyes open but if I try to lay down to take a nap, I can't fall asleep.
It's inexplicable why sleep is more difficult at age 72 but it is.
Having a toddler full-time at 72 is difficult, and maybe unfair.