Never tired

Bath, sleepy tonie box character, toys away, tv off, bedtime story, dimmed lights xxxx

That completely sounds like mine. I also have an 3 year old and a 1 year old. It is so tiring (mentally) and my 3 year old goes nursery too (3days a week now) which she does get tired once I pick her up on the way. But yeah, through out the day, it’s non-stop and my 1 year old is all over. Can’t win. I lose it after a while because I just want a breather and just to have a minute to myself but no.
I say also, maybe try out quiet time with your eldest when your youngest is napping.
Hope this helps. 😊

I know this might sound crazy but that does seems like a very long time for littles to be awake have you tried pushing that bedtime forward because being over tired actually makes bedtime a million times harder! For reference my twins are almost 4 and baby is 8 months everyone is up at 5:30-6am and bedtime at 6:30pm for baby (with 2 naps) and 7:15pm for twins with no naps. If not take a look at their diet. If non of that works please just ask them what caffeine they been taking so I can have the same energy for my kids all day 🤭🥰❤️

If getting up at 5/6 then I would be saying bed time routine starts at 6.

Look at diet, no sugar or additives.

No or limited screen time.

Reducing all stimulation leading up to bed time, dimmed lights quieter sounds.

Bath, then a rub down with moisturiser (sounds weird but its about bringing their awareness back to their body)

Essential oils like lavender/roman chamomile (can be added to bath)

Night time vitamins/kids night time rescue remedy (only 3yo)