I'm guessing here ...
I'm presuming in the evening he is just sitting down watching tv ...
Cos he 'deserves a rest' after a hard day's work ... of 8 hours duration!!
You are STILL looking after the kids, clearing up, getting stuff ready for morning etc etc
AND you will still be up in the night to look after the kids ... as you have done for YEARS.
You are on call 24 hours a day.
You are exhausted.
Sit him down. Tell him you want to spend more quality time with him.
But the evening jobs HAVE to be divided up between you. Work out a fair division.
After a certain time each night (9pm? 10pm? 11pm?) YOU are off duty. Pour two glasses of wine.
Spend half an hour ON YOUR OWN - in the bath, shaving your legs, reading a book, whatever.
He looks after the kids till he comes to bed.
You get to be YOU again.
He gets to shoulder more of the load, so realises just how tiring small children can be.
Snuggle up, drink your wine and talk to each other.
No expectations of sex. Just affection and closeness.
Tell him you need a week or so of this every night before ANYTHING will happen. You need to reconnect with each other.
You - like most women - need affection to feel sexy.
Give it time and your libido will return.
Xxx