How to stop springer spaniel waking us up at 5.00am

Hi,
I have a 5 month old springer. Currently he sleeps in his bed in our open plan kitchen/diner/playroom. This area is at the back of the house and seperated from the living room by a set of double doors with obscure glass panels and another solid door.

More or less since we got him he has been waking early and jumping at the glass doors which vibrate and make a racket. We thought we'd solved this by putting chairs in front of the glass doors at night so he can't get to them. Now he does the same to the solid door.

This isn't to go to the toilet because if we let him out and bring him back in and return to bed he just starts up again. I don't want to give him the association that if he pounds the doors then we come running.

However it is impossible to go back to sleep it's so noisy. I don't want to allow him the run of the whole house unsupervised because he chews etc. I think if we don't solve this my husband will insist we let the dog go as we are all exhausted! Hope you can help.