You might find this a helpful read
https://www.betterhealth.vic.gov.au/health/healthyliving/solutions-sleep-concerns-toddlers-1-3-years

Kids go through stages. Just make sure you check that their room isn’t getting bright in the morning now summer is coming or maybe the birds are waking them. Maybe you need to adjust their day time naps

Oh what a situation, no sleep, I remember it well. Hopefully it’s just a stage that will pass soon

Euky bear sleep and room spray…gold

Whats changed?
For them both to be like this is suggests that some kind of change has taken place either environment, diet or emotional.

Set up a bedtime routine. …
Relax before bedtime. …
Keep regular sleep and wake times / structure thoughout the day …
Kepp them active during the day …
Keep older children’s naps early and short. …
Make sure your child feels safe at night. …
Check noise and light in your child’s bedroom. …
Eat the right amount at the right time…
Avoid high sugar & processed foods with additives
Keep an eye on screen time….