Plan ahead Mine are 7, 4, and 1..so I manage pretty smoothly.
The hardest year I found was when DS1 was in kinder and DS2 was asleep at pick up time..I either had to risk (kinder only around the corner) a quick run in for Kinder pick up or wake him. Most of the time I would wake him.
Now I have DS1 at School, DS2 at Kinder and DD tagging along no matter what time. She just fits in with whatever, eats and sleeps on the run. I found I am alot more relaxed about routine during the day with DD.
As for myself, I am in bed at 8:30pm most nights, read for 30mins and lights out! In fact that is probably 6 out 7 nights. I may stay up until 9:30pm on a Saturday
You are doing a great job, somehow it just all works. Yep, you have THOSE days where everything and anything can go wrong, they are few and far inbetween and are usually a good laugh with DH at the end of the day.