You both work full time so presumably you're doing 50% each of everything at home? 50% of nights with wakeful children? 50% each of early wake ups? 50% each of bath, bedtime, and breakfast? One lie in each per week? 50% each of all grocery shopping, food preparation, cleaning up after meals, general housework and cleaning? 50% each of taking and fetching children from school, nursery, any clubs or playing at friends the older one does? 50% of doctors and dentists appointments with the children? 50% each actively engaging with the children outside working hours?
Do both of you sometimes take the children - both children - out for a solid chunk of 3-4 hours so the other can relax (not so the other can do housework)? As well as doing things as a family of 4 sometimes?
Are you?
Or is your wife doing 80-95% of everything children and house and food related?
If you're genuinely sharing everything equally then it'd be normal at those ages for parents to have a couple of hours in the evening together after the children are in bed.
That's what we had until eldest was too old to go to bed before us regularly (for us parent enforcement of bedtime ends at age 16, lots of other people stop earlier. Our teen children tend to stay up with us in the living room rather than hang out in their rooms in the evening).
If you're not getting evening together after the children are in bed then I'd question whether your wife is exhausted from doing all the chores and childcare and night waking and early get ups while you sot about waiting for her to move seamlessly from attending to children to attending to you, without any time for herself. If so no bloody wonder she'd rather go to bed early by herself.
However if you genuinely, truly do 50% of everything non work related - all the house, food and child stuff -then there's something else wrong. Sleeping for 9-10 hours if genuinely not overloaded suggests depression or wanting to avoid you, tbh.