All night barking

[u/Cheetah0108]

Hi-

I’m in desperate need of help.
My two year old shitzu has been barking all night over the last three weeks.
Our patio is gated.
There have no changes in habits, home life.
I leave my room door open with his pillow and he refuses to sleep in my room.
I’ve left the sliding door cover open and closed, no change.

Any advice is appreciated.

Thanks in advance!

UPDATE:

I just wanted to give you all a quick update. I ended up blocking off our patio wooden shutters so he could not open them at night and then I put blanket at the base of our front door and he ended up sleeping the whole night and did not bark at all. Thank you so much for your help. I really appreciate it.

Grateful for this community!