10 month old suddenly stopped day naps?

Re

For the past 2/3 months I have been Able to put my baby down for around 2 naps a day. Always with milk but would go to sleep happily if I put him down in his cot. For a week now this has completely gone out of the window and I’m doing nothing different. He will fall asleep in my arms then will suddenly wake.

I have tried to nurse him to sleep which doesn’t work and leaving him in his cot. He just climbs the side of his cot and will whine or babble.

He doesn’t ever stay still during the day and is on the go constantly. Now I don’t even get the chance to have an hours rest and I’m exhausted. Plus I’m having to deal with an overtired baby for the rest of the day which is awful.

Any ideas anyone?